The Globe and Mail has published a watchlist commentary on Coherent Corp (NYSE: COHR), the photonics and engineered-materials maker, arguing that the stock is “cooling off just as its AI thermal opportunity heats up.” The piece frames a recent share-price pullback against what it presents as a growing opportunity for Coherent in thermal management for AI computing infrastructure.

This is investor commentary rather than a company announcement: Coherent has not, in this item, disclosed new products, contracts, or financial targets. The interesting question the piece surfaces is a structural one — whether heat removal, rather than chip supply, is becoming the binding constraint on how densely operators can pack AI accelerators into a rack.

Executive Summary

The commentary positions Coherent as a beneficiary of a well-documented shift in data center engineering: as AI accelerators draw ever more power per chip and per rack, traditional air cooling runs out of headroom, pushing operators toward liquid and advanced thermal solutions. In that framing, companies that supply thermal components and materials sit on the critical path of AI buildout alongside — and in some respects ahead of — the chipmakers themselves.

Why it matters: Coherent is best known in AI infrastructure for optical transceivers, the laser-based modules that carry data between GPU servers. A credible second exposure in thermal management would broaden its AI story beyond optics. But readers should be clear-eyed about what this item is: a stock-watch article pairing a price decline with a thematic opportunity. The theme — thermal as a gating constraint — is real and widely corroborated across the industry. The company-specific claim — that Coherent is positioned to capture it in size — is asserted here rather than evidenced with disclosed design wins, revenue figures, or customer names.

Why Cooling Is Becoming the Binding Constraint

For most of data center history, air cooling was sufficient: fans and chilled airflow could remove the heat a rack of servers produced. AI accelerators have broken that model. Each generation of GPU draws substantially more power than the last, and operators want them packed tightly together because AI training performance depends on short, fast connections between chips. More power in less space means more heat in less space — and air, a poor conductor, simply cannot carry it away fast enough at the densities modern AI racks demand.

The industry’s answer is liquid cooling in its various forms — cold plates bolted directly to chips, rear-door heat exchangers, and immersion systems — along with the pumps, coolant distribution units, interface materials, and specialty components that make those systems work. The practical consequence is that a data center’s usable capacity is increasingly set by how much heat it can reject, not by how many chips it can procure. That is the structural insight behind the editorial framing here, and it is well supported by how hyperscalers and colocation providers are actually redesigning facilities.

Where Coherent Fits — and Where the Evidence Thins Out

Coherent’s clearest and best-documented AI exposure is optical: it is one of the major suppliers of the high-speed optical transceivers that link GPU clusters inside AI data centers, a business that scales directly with AI networking buildout. On thermal management specifically, Coherent’s heritage is in engineered materials and components — including thermoelectric cooling technology from its acquisition history and deep expertise in materials such as silicon carbide and diamond that are valued precisely for how they handle heat. That is a plausible foundation for a thermal-management business serving AI systems.

Plausible, however, is not the same as demonstrated. This commentary does not cite disclosed thermal-management revenue, named customers, or design wins in AI cooling, and none are announced in the source item. Investors evaluating the thesis should look for those specifics in Coherent’s own filings and earnings materials. It is equally worth noting that the thermal opportunity has many claimants: established cooling and power-infrastructure vendors, cold-plate and coolant-distribution specialists, and component makers are all converging on the same market, and the eventual split of value among them is far from settled.

Reading a Watchlist Piece for What It Is

The article’s hook — a stock “cooling off” while its opportunity “heats up” — is a valuation argument, not a news event. Such framing can be useful: markets do sometimes mark down a company’s shares for near-term reasons even as a long-cycle demand driver strengthens. But the same framing can dress up an ordinary pullback as a buying opportunity without establishing that the underlying business has changed. The honest read is that the macro thesis (thermal constraints on AI density) stands on broad industry evidence, while the micro thesis (Coherent as a distinct winner in thermal) rests, in this piece, on positioning rather than disclosed numbers.

For infrastructure operators and buyers, the takeaway is less about one stock and more about procurement reality: cooling capability is becoming a first-order selection criterion for sites, racks, and system vendors. Facilities designed only for air cooling face expensive retrofits, and supply of liquid-cooling components has become a schedule risk on AI deployments in its own right. Whoever the eventual share winners are, the direction of spend is not in serious dispute.

Background

Coherent Corp traces its lineage to II-VI Incorporated, a Pennsylvania-based engineered-materials and photonics company founded in 1971, which grew through decades of acquisitions — including thermoelectric-cooler maker Marlow Industries and optical-component businesses — before acquiring laser maker Coherent Inc. in 2022 and taking its name. Today the company supplies lasers, optical networking components, and specialty materials across telecom, industrial, and data center markets, with AI data center networking emerging as a headline growth driver.

The market backdrop is the rapid escalation of power density in AI computing. Each accelerator generation draws more power, and clustering them tightly is essential to training performance, pushing rack heat loads beyond what air cooling handles economically. That has turned liquid cooling and advanced thermal components from a niche into one of the fastest-moving segments of data center infrastructure spending.

Source: Coherent Stock Is Cooling Off Just as Its AI Thermal Opportunity Heats Up — The Globe and Mail watchlist commentary on Coherent Corp (COHR) and the AI thermal management market.

Data Center Dynamics published an analysis on 25 June 2026 contrasting the cooling demands of AI factories — facilities purpose-built for dense GPU training and inference clusters — with those of conventional cloud data centers, arguing that liquid cooling is now essential for high-density AI workloads rather than an optional upgrade.

The piece lands amid an industry-wide retooling: operators worldwide are redesigning halls, mechanical plants, and supply chains around direct-to-chip and other liquid cooling approaches as accelerated computing outgrows the air-cooled designs that served the cloud era.

Executive Summary

The core claim is straightforward: the data center designs that carried the cloud computing era are hitting a physical ceiling. Conventional cloud halls were engineered around air cooling — moving chilled air through racks drawing power in the single-digit-to-low-double-digit kilowatt range. AI training clusters concentrate far more power in each rack, because modern GPU systems pack accelerators tightly together to keep them on fast, short interconnects. At those densities, air simply cannot carry heat away fast enough, and liquid — which is far denser and holds vastly more heat per unit volume than air — becomes the only practical medium.

Why it matters: cooling is no longer a back-of-house mechanical detail but a gating factor for who can host AI workloads at all. Operators with liquid-ready facilities can court the highest-value tenants; operators with legacy air-cooled halls face expensive retrofits or a narrowing addressable market. For enterprises buying AI capacity, a provider’s cooling architecture is now a proxy for whether it can actually deliver current-generation GPU infrastructure.

The analysis frames this as a structural divide — ‘AI factory’ versus ‘cloud hall’ — rather than a spectrum, which is a useful lens even if real-world facilities often blend both.

The Physics Sets the Deadline, Not the Marketing

Air cooling works by blowing large volumes of conditioned air through servers, and it has a well-understood practical ceiling: as rack power climbs, the airflow, fan energy, and temperature gradients required become unmanageable. Liquid cooling — most commonly direct-to-chip cold plates, where coolant flows across a metal plate bonded to the processor, or immersion, where hardware is submerged in a dielectric (electrically non-conductive) fluid — removes heat at the source with far greater efficiency. This is not a vendor preference; it is thermodynamics. Water-based coolants can absorb on the order of thousands of times more heat per unit volume than air, which is why every leading accelerated-computing platform roadmap now assumes liquid at the high end.

The important nuance is that the ceiling is not a single number. Well-engineered air systems with hot-aisle containment can stretch surprisingly far, and many inference and enterprise workloads will remain comfortably air-coolable for years. The ‘non-negotiable’ framing applies specifically to dense training clusters, where chips must sit physically close together for interconnect performance. Density is a networking decision as much as a thermal one — and that is precisely why it cannot be relaxed just to make cooling easier.

Economics: Liquid Costs More Up Front and Less to Run

Liquid cooling shifts spending from operations to capital. Cold plates, coolant distribution units, manifolds, leak detection, and plumbing add up-front cost and engineering complexity that air systems avoid. In exchange, operators typically get lower fan energy, better power usage effectiveness (PUE — the ratio of total facility power to IT power, where closer to 1.0 is better), and the ability to run warmer coolant loops that reduce or eliminate energy-hungry chillers. Heat captured in liquid at useful temperatures is also far easier to reuse — for district heating or industrial processes — than diffuse warm air.

The strategic consequence is that cooling architecture now shapes site selection and facility economics together. A liquid-cooled AI factory can put more revenue-generating compute on the same power envelope, which matters enormously when grid connections — not land or capital — are the scarcest input in the industry. That said, buyers should treat sweeping efficiency claims with care: realized PUE depends on climate, design discipline, and utilization, and figures quoted for flagship builds do not automatically transfer to retrofits.

Winners, Losers, and the Retrofit Question

The clearest winners are operators and builders that committed early to liquid-ready designs — reinforced floors for heavier racks, space for coolant distribution, higher-capacity power delivery — along with the supply chain behind them: cold-plate and CDU manufacturers, fluid suppliers, and mechanical contractors with liquid experience. Chipmakers benefit too, since liquid cooling removes a constraint on how much power their next generations can draw.

The harder story is the installed base. Thousands of existing air-cooled halls cannot be casually converted: adding liquid means new piping, floor loading analysis, leak-management protocols, and often a rethink of the entire mechanical plant. Some facilities will be retrofitted profitably, some will serve the still-large market for air-coolable workloads, and some will be stranded relative to AI demand. For colocation providers, the honest question customers should ask is not ‘do you support liquid cooling?’ but ‘how many megawatts of it can you deliver, at what density, and by when?’

Operational Risk: New Skills, New Failure Modes

Bringing liquid into the white space introduces failure modes the air-cooled era rarely faced: leaks near live electronics, coolant chemistry maintenance, and the coordination of facility water loops with IT equipment loops. None of these are exotic — mainframes were water-cooled decades ago, and modern systems are engineered with negative-pressure loops and leak detection — but they demand skills that many data center operations teams are still building. Expect certification programs, standardized quick-disconnect fittings, and reference designs to matter as much as raw technology in determining who executes this transition smoothly. The industry’s real constraint may be trained people, not parts.

Background

Data center cooling has followed computing density for decades: water-cooled mainframes gave way to air-cooled commodity servers in the client-server and cloud eras, when racks drawing modest power made air the cheap, simple choice. The generative AI boom reversed the trend — modern accelerator systems concentrate unprecedented power in single racks, and leading GPU platform roadmaps now assume liquid cooling at the high end, pulling the entire industry’s mechanical design along with them.

Data Center Dynamics, the publication behind this analysis, is a long-established trade outlet covering data center design and operations. Its framing of ‘AI factories’ versus conventional cloud facilities echoes terminology popularized by the accelerated-computing industry to describe purpose-built AI infrastructure — a sign of how thoroughly that vocabulary has permeated the sector.

Source: AI factory cooling vs cloud data centers: Why liquid cooling is essential for high-density AI workloads — a Data Center Dynamics analysis, published 25 June 2026, on why liquid cooling has become a baseline requirement for dense AI infrastructure.

Data Center Dynamics has published a comparison of the two competing approaches to direct-to-chip liquid cooling — single-phase, where a liquid coolant absorbs heat and stays liquid, and two-phase, where the coolant boils at the chip and carries heat away as vapor — framed around a single question: which is right for AI data centers in 2026?

That the trade press is treating this as a live, unsettled debate is itself the news. As AI accelerators push per-chip power beyond what air can remove, direct-to-chip liquid cooling has moved from exotic to expected, and the industry has not yet converged on which of the two variants will define the next generation of facilities.

Executive Summary

Direct-to-chip liquid cooling puts a cold plate in contact with the processor and runs coolant through it, removing heat far more efficiently than blowing air across a heatsink. Within that category, two architectures are competing. Single-phase systems circulate a liquid — typically treated water or a water-glycol mix — that warms up as it passes over the chip and is cooled elsewhere. Two-phase systems use an engineered dielectric fluid that boils directly on the cold plate; the phase change from liquid to vapor absorbs a large amount of heat at a nearly constant temperature, and the vapor is condensed back to liquid to repeat the cycle.

The choice matters because it is not easily reversible. Coolant chemistry, pressure ratings, manifolds, coolant distribution units, and facility water loops are all designed around one approach or the other. An operator committing today to a multi-hundred-megawatt AI campus is effectively placing a bet on which architecture will best handle the chips of 2028 and beyond — and on which supply chain, service model, and regulatory environment will mature fastest.

The DCD piece lands at the moment this bet has become unavoidable. Air cooling handled decades of servers; single-phase liquid is handling today’s AI racks; the open question is whether tomorrow’s thermal densities force the industry through a second transition to two-phase — or whether single-phase engineering keeps stretching to meet the need.

Why the Question Exists at All

For most of computing history, this debate would have been academic. Air cooling was cheap, well understood, and sufficient. AI training hardware broke that equilibrium: modern accelerators concentrate so much power in so little silicon that the limiting factor is no longer the data center’s chillers but the last few millimeters between the chip surface and the coolant. Direct-to-chip designs attack exactly that bottleneck, which is why they have become the default assumption for new AI builds.

Single-phase direct-to-chip won the first round largely on familiarity. Water-based cooling loops are a known quantity — data center engineers, plumbers, and component suppliers have decades of experience with pumps, valves, and leak management for liquid water. Two-phase systems promise something physically compelling in exchange for novelty: boiling a fluid absorbs latent heat, meaning the coolant can soak up substantially more energy without a large temperature rise, and it does so uniformly across the hottest parts of the chip.

The Engineering Trade-Offs, Plainly Stated

Single-phase’s strengths are operational. The fluids are inexpensive and benign, the components are commodity, leaks are messy but manageable, and the industry’s existing skills transfer directly. Its weakness is headroom: as chips run hotter, single-phase designs must push more liquid, faster, through smaller channels, and must manage the temperature gradient across the cold plate — the chip’s inlet edge runs cooler than its outlet edge, which complicates thermal design as power climbs.

Two-phase inverts that profile. Boiling heat transfer offers high performance and near-isothermal operation — the whole cold plate sits close to the fluid’s boiling point — which is attractive precisely where single-phase strains. But the costs are real: engineered dielectric fluids are far more expensive than water, systems must manage vapor and pressure rather than simple liquid flow, servicing a sealed two-phase loop is a different discipline, and several candidate fluids belong to chemical families (such as PFAS-related compounds) facing regulatory scrutiny in major markets. A technically superior heat-transfer mechanism does not automatically win if its fluid supply or compliance picture is uncertain.

Who Wins and Loses on Each Path

If single-phase continues to stretch, the winners are incumbents: established cooling vendors, existing supply chains, and operators who have already deployed water-based loops and want continuity. Chip designers absorb more of the burden, engineering packages and cold plates to live within single-phase limits. If two-phase becomes necessary, the advantage shifts toward specialist fluid and systems companies, and toward operators willing to build new competencies early — with the corresponding risk of backing immature technology.

There is also a middle path worth naming: hybrid facilities, where single-phase handles the bulk of the load and two-phase (or other advanced techniques) is reserved for the hottest components or highest-density halls. Many operators will likely hedge this way rather than commit wholesale, which suggests the 2026 answer to “which is right?” may genuinely be “both, in different places” — an unsatisfying but rational outcome for an industry making thirty-year infrastructure bets on three-year chip roadmaps.

What This Means for the Broader Market

The cooling decision cascades outward. Coolant choice affects how much heat a facility can reject to the outside world and at what temperature, which shapes heat-reuse opportunities and water consumption. It affects colocation providers, who must decide which architecture to offer tenants whose hardware they do not control. And it affects the retrofit market: the vast installed base of air-cooled data centers faces different conversion economics depending on which liquid architecture prevails. Standardization efforts — common connectors, fluid specifications, and safety practices — will matter as much as raw thermal performance in determining which camp scales fastest.

Background

Data centers spent decades cooled almost entirely by air: chilled air pushed through raised floors and hot aisles, with per-rack power low enough that fans and heatsinks sufficed. The AI buildout broke that model. Training clusters pack accelerators drawing unprecedented power into dense racks, pushing the industry through its biggest thermal transition since the mainframe era — first to rear-door heat exchangers and now to liquid brought directly to the chip.

Data Center Dynamics, the publication behind this comparison, is a long-running trade outlet covering data center design and operations. That its editorial attention has moved from whether to liquid-cool to which liquid architecture to choose reflects how quickly direct-to-chip cooling has become the baseline assumption for AI infrastructure — and how much unresolved engineering debate still sits beneath that baseline.

Source: Two-phase vs single-phase direct-to-chip liquid cooling: Which is right for AI data centers in 2026 — a Data Center Dynamics comparison of the two competing direct-to-chip liquid cooling architectures for AI data centers, published May 29, 2026.

Engineering trade publication Electronics360 published an analysis on May 24, 2026 arguing that direct-to-chip (D2C) liquid cooling — circulating coolant through cold plates mounted directly on processors — has crossed from a design option to a practical requirement, driven by AI accelerator chips whose power draw has reached the multi-kilowatt range per device.

The piece frames this as the end of an era: air cooling, the default thermal strategy for data centers since the industry’s beginning, can no longer keep pace with the heat that flagship AI silicon produces in the small area of a single chip package.

Executive Summary

The core claim is thermodynamic rather than commercial: individual AI processors now dissipate thousands of watts each, and moving that much heat out of a dense rack with air alone requires airflow volumes and temperature differentials that become impractical or impossible at the densities AI clusters demand. Direct-to-chip liquid cooling, which places a liquid-filled cold plate against the chip itself, removes heat far more efficiently because liquids carry heat orders of magnitude better than air.

Why it matters: if D2C is genuinely mandatory rather than optional, every layer of the data-center stack changes — facility design, plumbing, power distribution, rack architecture, maintenance skills, and capital budgets. Operators of existing air-cooled facilities face retrofit decisions, and new builds are being designed liquid-first. For an industry that standardized on air handling for decades, this is a foundational transition, not an incremental upgrade.

Physics Ended the Debate Before the Market Did

Air cooling persisted as the default not because it was elegant but because it was cheap, simple, and universally understood. Its limitation is fundamental: air is a poor heat conductor, so cooling a hotter chip means moving more air, faster, across larger heatsinks. As AI accelerators pushed past one kilowatt per device — with roadmaps pointing well beyond — the heat concentrated in a few square centimeters of silicon began to exceed what any realistic airflow can absorb. Water and engineered coolants transfer heat dramatically more effectively, which is why cold plates bolted directly onto the chip package have become the pragmatic answer.

The word ‘mandatory’ in the source’s framing is worth taking seriously but precisely. Air cooling is not disappearing from data centers generally — the vast installed base of conventional enterprise and cloud workloads runs at rack densities air handles fine. The mandate applies to the frontier: dense AI training and inference clusters built around multi-kilowatt accelerators. That distinction matters for anyone budgeting a transition.

The Retrofit Question Splits the Market

Liquid-first design is straightforward in a new build: coolant distribution units, manifolds, leak detection, and higher floor loading are engineered in from day one. Retrofitting an existing air-cooled facility is harder. Piping must be routed through spaces never designed for it, water supply and heat-rejection capacity must be added, and operations teams must learn to manage a system where a leak — rare but nonzero — sits inches from expensive silicon.

This creates a divergence in asset value across the industry. Facilities that can economically accept liquid cooling — because of their power capacity, structure, and location — become more valuable as AI demand grows. Older facilities that cannot may be relegated to lower-density workloads. Colocation providers, hyperscalers, and enterprise operators are all making that assessment now, and the answers will shape which real estate wins the AI buildout.

A New Supply Chain Rises Around the Cold Plate

A shift of this scale redraws the vendor landscape. Demand moves toward cold plates, coolant distribution units, quick-disconnect fittings, dielectric and water-based coolants, leak-detection systems, and rear-door or facility-level heat exchangers — categories that were niche a few years ago. Established thermal-management and precision-cooling vendors are competing with newer specialists, and chip and server makers increasingly ship liquid-ready designs, effectively deciding the question for their customers.

There is also an efficiency dividend. Because liquid captures heat at the source, less energy is spent on fans and air handling, and the warm coolant leaves at temperatures useful for heat reuse in some settings. For operators facing scrutiny over data-center energy consumption, D2C offers a genuine efficiency story — though it introduces its own considerations around water use and coolant handling that deserve equally honest accounting.

Background

For most of computing history, data centers were cooled the same way: chilled air pushed through raised floors or ducts, across finned metal heatsinks, and back to air-handling units. That model worked because individual chips drew tens or hundreds of watts. The AI era broke the assumption — training and running large models rewards packing the most powerful accelerators as densely as possible, and each generation of AI silicon has raised per-chip power substantially, crossing the kilowatt mark and continuing upward.

Liquid cooling itself is not new; mainframes and supercomputers used water cooling decades ago before commodity air-cooled servers displaced them on cost. What has changed is that the physics that once made liquid cooling a supercomputing niche now applies to mainstream AI infrastructure, pulling a once-specialist discipline back to the center of data-center design.

Source: Multi-kilowatt chips make D2C cooling mandatory — Electronics360 analysis (May 24, 2026) on why multi-kilowatt AI processors are forcing data centers from air cooling to direct-to-chip liquid cooling.

Iceotope, a UK-based data center cooling technology startup, has raised $26 million in new funding and says it intends to use the capital to scale, as reported by SiliconANGLE on May 14, 2026. The company specializes in liquid cooling — removing heat from servers with circulating fluid rather than fans and chilled air — a technology segment that has moved from niche to near-mandatory as AI computing hardware grows hotter and denser.

Executive Summary

The announcement itself is brief: a $26 million raise and a stated intent to scale. Investors, valuation, and use-of-proceeds details were not included in the source report. But the timing and the segment tell a larger story. Racks built for AI training and inference now routinely draw power densities that air cooling physically struggles to handle, and every serious data center operator is being forced to evaluate liquid cooling in some form.

For Iceotope, a longtime specialist in what it calls precision liquid cooling, fresh capital is a bet that the company can convert years of engineering work into deployments at the exact moment demand is inflecting. For the industry, it is one more data point that capital continues to flow toward the thermal side of the AI infrastructure buildout — not just chips and buildings, but the plumbing that keeps them running.

Why Investors Keep Funding the Thermal Layer

Cooling used to be a background line item in data center design. AI changed that. Modern accelerator-dense racks can draw many times the power of a traditional enterprise rack, and nearly all of that electricity becomes heat that must be removed. Air — the industry’s default coolant for decades — becomes impractical at these densities: you simply cannot move enough of it through a rack fast enough. Liquids carry heat far more efficiently, which is why liquid cooling has shifted from an exotic option to a planning assumption for new AI capacity.

A $26 million round is modest by AI-infrastructure standards, where individual data center campuses are financed in the billions. But it fits the pattern of the moment: investors funding the enabling-technology layer around the AI buildout, on the thesis that whoever wins the compute race, the cooling suppliers get paid. That thesis does not require picking a winning chipmaker or cloud — only believing that rack densities keep rising, which is currently one of the safer bets in the industry.

Where Iceotope Sits in a Crowded Field

Liquid cooling is not one technology but several. Direct-to-chip cooling pipes fluid through cold plates mounted on processors and has become the mainstream choice for hyperscale AI deployments. Immersion cooling submerges entire servers in dielectric (non-conductive) fluid. Iceotope’s approach — precision liquid cooling — delivers dielectric fluid to components inside a sealed chassis, aiming to capture most of immersion’s thermal benefits without the tanks and handling challenges of full immersion.

The competitive field is intense and getting more so. Large incumbents such as Vertiv and Schneider Electric have built out liquid cooling portfolios, cold-plate specialists serve the hyperscalers, and a cluster of venture-backed startups pursue immersion and chassis-level designs. Iceotope’s differentiation has historically rested on serviceability and suitability for edge and telecom environments as well as data halls — places where a sealed, self-contained cooling design matters. Whether that positioning wins share against the direct-to-chip mainstream is the central commercial question the company’s new capital must answer.

What $26 Million Buys — and What It Doesn’t

For a hardware company, scaling means manufacturing capacity, channel partnerships, and the field engineering to support deployments — all capital-intensive. A raise of this size can fund meaningful expansion for a focused firm, but it does not buy the balance-sheet heft of the industrial giants it competes with. That makes partnerships with server makers and infrastructure vendors, which Iceotope has cultivated in the past, strategically essential: the realistic path to volume for a cooling specialist runs through OEM channels rather than direct sales alone.

The flip side of a crowded, strategically important market is consolidation. Thermal management specialists have been steady acquisition targets for larger infrastructure players seeking credible AI-cooling stories. A funded, technology-differentiated company in this segment is both a competitor and, plausibly, a future acquisition — an outcome investors in this space have historically been comfortable underwriting. That is analysis of market structure, not a prediction about this company; the source report says nothing about Iceotope’s strategic intentions beyond scaling.

Background

Iceotope is a UK-based cooling technology company that has spent years developing chassis-level liquid cooling, branding its approach precision liquid cooling. It raised significant venture funding in 2021 and has pursued a partner-led route to market, working with server and infrastructure vendors to package its cooling into deployable systems for data centers, edge sites, and telecom environments.

The market context transformed around it. The generative AI boom that began in late 2022 drove data center rack power densities sharply upward, straining air cooling and turning liquid cooling into one of the fastest-growing categories in data center infrastructure. Incumbents, startups, and hyperscalers alike have poured investment into the segment, making thermal management a strategic battleground rather than a commodity afterthought.

Source: Data center cooling tech startup Iceotope aims to scale after raising $26M — SiliconANGLE report, May 14, 2026, on Iceotope’s $26 million funding round.

Data Center Knowledge published an analysis on May 11, 2026, titled “Redefining Hydronic Design for D2C Liquid Cooling,” addressing how the shift to direct-to-chip (D2C) liquid cooling is changing the way data center water systems — the hydronic plant — must be designed. The piece lands amid an industry-wide transition in which AI-driven rack power densities have climbed beyond what traditional air-cooled facility designs were built to handle.

Executive Summary

The core issue flagged by the headline is straightforward but consequential: direct-to-chip liquid cooling — where coolant is piped through cold plates mounted directly on processors, rather than cooling servers with chilled air — does not simply bolt onto the chilled-water infrastructure most data centers already have. Hydronic design, meaning the engineering of the pumps, piping, heat exchangers, and control systems that move liquid through a facility, was historically sized around air handlers serving racks of modest power draw. D2C changes the temperatures, flow rates, water quality requirements, and failure modes the plant must support.

Why it matters: liquid cooling has moved from niche to mainstream as AI accelerators push per-rack power well beyond what air can economically remove. Operators deciding between retrofitting existing plants and building new liquid-native facilities are making capital decisions that will constrain them for decades. A trade-press focus on hydronic fundamentals — rather than just on the servers or cold plates — signals that the industry’s bottleneck conversation is shifting upstream, from the rack to the plant room.

The Plant Room Becomes the Bottleneck

For two decades, data center cooling design treated the white space and the plant as loosely coupled: air handlers absorbed variation on the floor, and the chilled-water loop behind them changed slowly. Direct-to-chip cooling collapses that buffer. The coolant loop now terminates inches from the silicon, typically through a coolant distribution unit (CDU) — a device that isolates the clean, tightly controlled technology loop serving the servers from the facility water loop. That coupling means plant-side decisions about supply temperature, flow stability, and redundancy propagate directly to chip behavior, and legacy assumptions about acceptable temperature bands and transient response no longer hold automatically.

This is why hydronic design is having its moment in the trade press. The hard problems in liquid cooling are increasingly civil and mechanical engineering problems — pipe sizing, pump redundancy, water treatment, commissioning — not server-vendor problems. Operators who treat D2C as a rack-level product purchase, rather than a facility-level design change, risk discovering the mismatch after the equipment is on the dock.

Warm Water Changes the Economics

A frequently underappreciated aspect of D2C cooling is that cold plates can generally accept much warmer supply water than air-cooling systems require. Warmer facility water expands the hours in which outside air can reject heat without running chillers — so-called free cooling — which can reduce energy consumption and, in some designs, eliminate mechanical refrigeration for part or all of the year. But capturing that benefit requires designing the hydronic system around it: heat exchangers, dry coolers, and controls sized for warm-water operation, not a legacy chilled-water loop running at temperatures chosen for air handlers.

The economics cut both ways. A retrofit that simply taps an existing chilled-water plant may work, but it can leave the efficiency upside of liquid cooling unrealized and burden an aging plant with duty it was never sized for. A purpose-designed warm-water system costs more up front and demands different operational expertise. The Data Center Knowledge piece’s framing — redefining hydronic design rather than extending it — suggests the editorial judgment that incrementalism has limits here, a view worth testing against each facility’s actual constraints.

Winners, Losers, and the Skills Gap

If hydronic design is the new frontier, the beneficiaries are the firms that own that competence: mechanical engineering consultancies, CDU and heat-rejection equipment manufacturers, and colocation providers that invested early in liquid-ready plants. Operators of large fleets of air-era buildings face harder choices — retrofit selectively, densify only some halls, or cede the highest-density workloads to newer facilities. There is also a human dimension: hydronic systems at this criticality level need commissioning agents and operators fluent in water chemistry, two-phase transients, and leak response, and that talent pool is thin relative to the pace of AI buildout.

None of this makes air cooling obsolete. Most enterprise workloads remain comfortably air-coolable, and hybrid facilities — liquid for accelerator rows, air for everything else — are likely the dominant pattern for years. The design challenge the article’s title points to is precisely that hybridity: one plant serving two very different thermal customers.

Background

Data centers have been overwhelmingly air-cooled since the industry’s beginnings: chillers or outside air cool water, water cools air handlers, and air cools servers. That chain held while racks drew a few kilowatts each. The AI buildout of the mid-2020s broke the assumption, as accelerator-dense racks pushed power draw to levels where moving enough air became impractical, driving rapid adoption of direct-to-chip liquid cooling across hyperscale, colocation, and enterprise deployments.

The transition has unfolded in stages — first server-level cold plates, then rack-level manifolds and CDUs, and now, as this Data Center Knowledge piece reflects, a reckoning with the facility-level hydronic plant itself. Industry bodies and operators have been working toward common temperature classes and reference designs, but practice is still consolidating, which is why plant-level design questions remain live editorial territory in 2026.

Source: Redefining Hydronic Design for D2C Liquid Cooling — Data Center Knowledge analysis, published May 11, 2026, on how direct-to-chip liquid cooling is reshaping data center water-system design.

CoreWeave, the AI-focused cloud provider, published a piece titled “Liquid Cooling for AI Data Centers: Run Cold, Act Bold,” making the argument that liquid cooling — circulating fluid directly to or near the chips rather than relying on chilled air — should be treated as the default engineering choice for dense AI training and inference clusters, not a specialty option.

The post, surfaced in early May 2026, is a vendor thought-leadership piece rather than a product or facility announcement: no new sites, capacity figures, or customer commitments accompany it. Its significance lies in who is saying it — one of the largest dedicated AI cloud operators publicly framing liquid cooling as table stakes.

Executive Summary

The core claim is architectural: modern AI accelerators are being packed into racks at power densities that air cooling struggles to serve economically, so operators who standardize on liquid cooling now will deploy the newest hardware faster and run it more efficiently than those who retrofit later. That position aligns with the direction of the hardware itself — flagship AI rack systems from the leading accelerator vendors are increasingly designed around liquid cooling from the outset.

Why it matters: cooling has quietly become one of the binding constraints on AI buildout, alongside power availability and chip supply. A data center designed for traditional air-cooled racks often cannot accept the densest AI systems without significant rework of its mechanical plant, piping, and floor layout. When a major AI cloud provider says liquid cooling is the default, it is effectively telling the colocation and construction ecosystem what the demand side now expects.

For buyers and investors, the practical takeaway is less about CoreWeave specifically and more about the signal: the market for AI capacity is bifurcating between facilities that can support liquid-cooled density and those that cannot, and the gap affects deployment speed, efficiency, and ultimately the cost of delivered compute.

Why Cooling Became the Bottleneck

For most of the data center industry’s history, air cooling was sufficient: racks drew a few kilowatts, and moving enough cold air through the room was a solved problem. AI changed the arithmetic. Training clusters concentrate power-hungry accelerators as tightly as possible to shorten the distances data travels between chips, because interconnect latency and bandwidth directly affect training performance. That pushes rack densities far beyond what conventional air handling was designed for, and at some point the physics favors liquid — water and engineered fluids carry heat far more effectively than air.

CoreWeave’s framing of liquid cooling as a default rather than an exception reflects where the hardware roadmap already points. The densest current-generation AI rack systems are engineered for direct liquid cooling, meaning operators who want the newest silicon at full density have limited choice. In that sense the post is less a prediction than a description of a constraint the industry is already living with — but stating it as doctrine matters, because much of the world’s existing data center stock was not built for it.

The Economics: Efficiency Versus Retrofit Cost

The business case for liquid cooling rests on two ledgers. On the operating side, liquid systems can reduce the energy spent on cooling itself — a meaningful lever, since cooling is typically one of the largest non-IT loads in a facility, and every watt saved on cooling is a watt available for revenue-generating compute in power-constrained markets. On the capital side, however, liquid cooling requires piping, coolant distribution units, leak management, and often structural changes, which is straightforward in a new build and expensive in a retrofit.

That asymmetry is the strategic subtext of a piece like this. Operators that standardized early on liquid-ready designs can absorb each new accelerator generation with incremental changes; operators with large air-cooled footprints face a harder choice between costly conversion and ceding the densest workloads. CoreWeave, which built its business specifically around GPU infrastructure for AI, has an obvious interest in emphasizing a criterion where purpose-built AI clouds hold an advantage over general-purpose incumbents — which does not make the underlying engineering argument wrong, but readers should recognize the alignment between the message and the messenger.

Winners, Losers, and the Supply Chain Ripple

If liquid cooling is the default, the beneficiaries extend well beyond AI clouds. Suppliers of coolant distribution units, cold plates, piping, and heat-rejection equipment see their addressable market expand from a niche to a standard line item in every AI facility. Colocation providers with liquid-ready halls gain pricing power for AI tenants; those without face pressure to invest. Engineering and construction firms with liquid-cooling experience become scarcer resources in an already stretched buildout.

The risk side deserves equal attention. Liquid cooling adds mechanical complexity — leaks, coolant chemistry, maintenance procedures — into environments that prize uptime above almost everything. Standardization across vendors is still maturing, which raises the possibility of stranded investment if designs shift between hardware generations. And efficiency gains at the rack level do not eliminate the larger constraint: many AI projects today are gated by grid power availability, a problem no cooling technology solves on its own.

Background

CoreWeave began as a cryptocurrency mining operation before pivoting to GPU cloud computing, and rode the generative AI boom to become one of the largest providers of dedicated AI infrastructure, going public in 2025. Its business model — building or leasing data centers purpose-designed for dense GPU clusters and renting that capacity to AI developers — makes facility engineering choices like cooling central to its competitive position.

The broader industry context: for decades, air cooling dominated data centers because rack power draws were modest. The AI era reversed that, with accelerator racks reaching power densities that favor liquid-based heat removal, and the latest flagship AI rack systems are designed for liquid cooling from the factory. That has turned cooling from a back-of-house mechanical detail into a strategic differentiator in the race to deploy AI capacity.

Source: Liquid Cooling for AI Data Centers: Run Cold, Act Bold — CoreWeave, a vendor blog post arguing for liquid cooling as the default architecture for dense AI clusters.

Keppel and Shell will launch an immersion cooling pilot at a data center in Singapore, according to an April 2026 report by Data Center Dynamics. Immersion cooling submerges servers in a non-conductive (dielectric) liquid instead of blowing chilled air across them, and the pilot pairs one of Asia’s most established data-center operators with an energy major that has been developing cooling fluids as a specialty product line.

Executive Summary

The announcement is short on specifics — no facility name, timeline, capacity, or fluid specification was reported — but the pairing itself is the story. Keppel is a longtime data-center developer and operator headquartered in Singapore, and Shell is one of several oil-and-gas majors that have built immersion cooling fluids into their lubricants and specialty-chemicals portfolios. A pilot puts that product in a live operator environment, which is the step fluid vendors need before operators will commit production workloads.

It matters because the industry’s cooling assumptions are shifting. AI accelerators have pushed per-rack power draws well beyond what conventional air cooling handles economically, and Singapore — a tropical, land- and power-constrained market that conditions new data-center capacity on efficiency — is one of the most demanding places to prove out an alternative. If immersion works commercially anywhere, a Singapore pilot is a credible proving ground.

Why Air Cooling Is Running Out of Headroom

For decades, data centers were cooled the same basic way: chill air, push it through server racks, and exhaust the heat. That model works well at the rack densities of the cloud era — roughly 5 to 15 kilowatts per rack — but AI training and inference hardware has driven densities several times higher, and air simply cannot carry heat away fast enough at those levels without extreme airflow and energy cost. Liquid conducts heat far more effectively than air, which is why the industry is moving toward direct-to-chip liquid cooling and, at the more radical end, full immersion.

Immersion cooling takes the concept to its logical conclusion: the entire server is submerged in a bath of dielectric fluid — a liquid engineered not to conduct electricity — so every component sheds heat directly into the liquid. Proponents cite lower cooling energy, reduced fan power, and quieter, denser halls. The trade-offs are real too: servicing a submerged server is messier, hardware warranties and supply chains are built around air, and the fluid itself is a new consumable with its own cost and lifecycle. A pilot is precisely how an operator quantifies those trade-offs on its own workloads rather than a vendor’s test bench.

An Oil Major’s Route Into the Data-Center Thermal Stack

Shell’s participation reflects a broader pattern: oil-and-gas companies repositioning parts of their refining and lubricants expertise toward digital infrastructure. Immersion fluids are, at bottom, specialty chemistry — the same competency that produces engine oils and transformer fluids — and Shell has marketed immersion cooling fluids for several years as part of its lubricants business. For an energy major, data-center cooling offers a growth market tied to AI demand at a time when traditional fuel demand faces long-term uncertainty.

For operators, the entry of large chemical producers addresses a practical adoption barrier: fluid supply at scale, with the quality control, safety documentation, and global logistics that hyperscale procurement requires. A niche fluid from a small vendor is a harder bet for a facility designed to run twenty years. That said, the release as reported does not disclose the commercial structure here — whether Shell is supplying fluid, co-developing the system, or simply lending its name to a joint trial — and those are very different depths of commitment.

Singapore Is a Deliberately Hard Test Bed

Singapore is one of the world’s most important data-center hubs and also one of its most constrained. The city-state paused new data-center approvals for several years over energy concerns, and when it resumed allocations it tied new capacity to stringent efficiency standards. Add a tropical climate — where conventional cooling works hardest and free-air economization is largely unavailable — and Singapore becomes a stress test: cooling technology that pencils out there has cleared a high bar.

That context cuts both ways for this pilot. It gives the results credibility if they are published, and it aligns with Keppel’s interest in squeezing more compute from a fixed power and land envelope. But it also means the pilot’s findings may flatter immersion relative to temperate markets, where cheap outside-air cooling narrows the efficiency gap. Operators elsewhere should read any results with their own climate and power costs in mind.

What a Pilot Proves — and What It Doesn’t

A pilot answers engineering questions: real-world efficiency, serviceability, fluid behavior over time, and how existing operational teams adapt. It does not answer the commercial questions that determine adoption — total cost of ownership at fleet scale, hardware-vendor warranty support, insurance treatment, and whether tenants will accept immersed infrastructure. The history of data-center cooling includes many well-run pilots that never converted to production deployments because the economics or the supply chain wasn’t ready.

The measured read is that this announcement signals direction, not destination. Keppel gains hands-on data for future builds in a market that rewards efficiency; Shell gains an operator reference in a marquee hub. Whether it becomes more than that depends on results neither company has yet reported.

Background

Keppel has been building and operating data centers for over two decades and is one of Asia’s most established players in the sector, with Singapore as its home market. Singapore itself paused new data-center approvals for several years over energy concerns before resuming allocations under strict efficiency conditions, making cooling performance a gating factor for growth there. Shell, like several energy majors, has extended its lubricants and specialty-chemicals expertise into immersion cooling fluids as demand for high-density computing rises — part of a broader repositioning of oil-and-gas capabilities toward digital infrastructure.

Source: Keppel and Shell to launch immersion cooling pilot at Singapore data center — Data Center Dynamics report, April 25, 2026, on a planned immersion cooling trial at a Keppel data center in Singapore.

Data Center Knowledge reported on April 23, 2026 that cooling has moved to the forefront of data center design challenges, driven by the power density of AI computing. The trade publication’s framing captures a shift the industry has been living through: thermal management, once a back-of-house engineering detail, now shapes where facilities are built, how they are architected, and how quickly they can serve AI demand.

Executive Summary

The report’s core argument is structural rather than incremental: artificial intelligence has changed the physics of the data hall. Traditional enterprise servers could be cooled with chilled air pushed through raised floors and contained aisles. AI training and inference clusters concentrate far more electrical power — and therefore far more heat — into each rack than air can economically remove, forcing designers to treat heat rejection as a first-order constraint alongside power availability and land.

Why it matters: when cooling becomes the binding constraint, it stops being a line item and starts being a strategy. Choices between air, direct-to-chip liquid cooling (circulating coolant through cold plates mounted on processors), rear-door heat exchangers, and immersion systems now determine a facility’s compatibility with next-generation chips, its water and energy footprint, and its retrofit economics. Operators, colocation providers, and their customers are all repricing those decisions in real time.

When Air Runs Out of Headroom

Air cooling served the industry for decades because server heat loads were modest and evenly distributed. AI accelerators break that model: they pack extraordinary computation — and heat — into small silicon footprints, and operators deploy them in dense clusters to keep chip-to-chip communication fast. Past a certain density, moving enough air through a rack becomes physically impractical and economically punishing, because fan energy and airflow engineering costs rise steeply while cooling effectiveness plateaus.

Liquid is the natural successor because water and engineered coolants carry heat far more efficiently than air. But switching thermal mediums is not a component swap. It changes piping, floor loading, leak detection, maintenance procedures, and the skills a facilities team needs. That is why the trade press now describes cooling as a design challenge rather than an operations task: the decision has to be made before concrete is poured, and it constrains everything after.

The Retrofit Divide: Winners and Losers

The shift creates a two-tier market. New builds designed liquid-ready from day one can court the highest-value AI tenants. Older facilities — the majority of the world’s installed base — face a harder calculus: retrofitting liquid cooling into a live building is disruptive and expensive, but declining to retrofit risks ceding AI workloads entirely and competing for a shrinking pool of conventional enterprise demand.

The beneficiaries are visible across the supply chain: cooling equipment manufacturers, mechanical engineering firms, and colocation providers with modern, high-density-capable inventory. The squeezed parties are operators of legacy stock and, potentially, customers who signed long leases in facilities that cannot follow the density curve. For buyers of data center capacity, a facility’s thermal architecture is becoming as important a diligence question as its power contract.

Cooling as a Sustainability and Siting Question

Cooling choices also carry environmental and community consequences. Evaporative systems trade energy efficiency for water consumption — a sensitive issue in drought-prone regions where many data center clusters sit. Closed-loop liquid systems can reduce water draw and, in some designs, make waste heat recoverable for district heating or industrial reuse. As municipalities scrutinize data center growth, thermal design is increasingly part of the permitting and public-acceptance conversation, not just the engineering one.

That elevates cooling from a cost center to a siting variable. A design that minimizes water use or enables heat reuse can be the difference between a fast permit and a contested one — a dynamic worth watching as AI capacity expansion collides with local resource politics.

Background

For most of the industry’s history, data center design was governed by power and space, with cooling treated as a solved problem: chilled air, raised floors, and hot-aisle containment handled the modest, evenly distributed heat of enterprise servers. The AI buildout that accelerated after 2022 broke that assumption. Training and serving large models requires dense clusters of power-hungry accelerator chips, and each hardware generation has pushed per-rack heat loads further beyond what air-based systems were designed to handle.

The result has been a rapid industry pivot toward liquid-based thermal architectures — direct-to-chip cold plates, rear-door heat exchangers, and immersion systems — and a re-sorting of the market between facilities that can host high-density AI workloads and those that cannot. Trade coverage like this Data Center Knowledge report reflects a consensus that has hardened across operators, chipmakers, and engineers: cooling is no longer downstream of design; it is design.

Source: AI Pushes Cooling to the Forefront of Data Center Design Challenges — Data Center Knowledge’s April 23, 2026 report on how AI rack densities are making thermal management a primary data center design constraint.