Billion-Dollar Acquisitions and Hot-Water Breakthroughs Signal a Turning Point for Data Center Cooling
Ecolab's $4.75 billion acquisition of CoolIT, Trane Technologies' purchase of LiquidStack, and NVIDIA's chiller-free Vera Rubin design mark a consolidation wave in data center cooling as AI power densities push the industry beyond the limits of air.
Overview
The data center cooling industry is undergoing its most significant realignment in years. Within a single week in March 2026, Ecolab announced a $4.75 billion acquisition of CoolIT Systems, Trane Technologies completed its purchase of immersion-cooling specialist LiquidStack, and NVIDIA revealed that its next-generation Vera Rubin GPU platform will operate with 45-degree-Celsius liquid cooling that eliminates the need for mechanical chillers. Together, these developments signal that thermal management has moved from a back-of-house engineering concern to a front-line strategic decision for anyone building or financing AI infrastructure.
Ecolab Bets $4.75 Billion on Liquid Cooling
On 19 March, Ecolab, the Minnesota-based water and hygiene conglomerate, agreed to acquire CoolIT Systems from private equity firm KKR and Abu Dhabi sovereign wealth fund Mubadala for $4.75 billion in cash, according to a BusinessWire filing. The deal values CoolIT at roughly 29 times its estimated next-twelve-month EBITDA.
CoolIT, headquartered in Calgary, designs and manufactures direct-to-chip liquid cooling systems. The company is expected to generate approximately $550 million in revenue over the next twelve months, positioning it among the largest pure-play vendors in the space. Dell’Oro Group, the market research firm, ranks CoolIT alongside Vertiv and nVent among the leaders in data center liquid cooling, a market the firm projects will reach roughly $7 billion in annual manufacturer revenue by 2029.
For Ecolab, the acquisition doubles its addressable market in the Global High-Tech segment from $5 billion to $10 billion. The company expects the deal to close in the third quarter of 2026, subject to regulatory approvals.
Trane Technologies Absorbs LiquidStack
Days earlier, on 3 March, Trane Technologies completed its acquisition of LiquidStack, a Carrollton, Texas-based company specializing in two-phase immersion cooling, in which servers are submerged in a thermally conductive dielectric fluid. The deal, first announced on 10 February, adds immersion cooling to Trane’s existing portfolio of air-side and chilled-water systems, giving the company what it describes as an end-to-end thermal management offering that spans from the central plant to the chip.
The Ecolab and Trane deals represent two different bets on the same underlying thesis: that legacy HVAC approaches cannot keep pace with the thermal loads generated by modern AI accelerators. A single NVIDIA Blackwell NVL72 rack, for instance, can consume upwards of 120 kilowatts. At those densities, air cooling becomes physically impractical.
NVIDIA’s Vera Rubin Redraws the Cooling Map
The most disruptive signal, however, may have come from the chip side. At GTC 2026, NVIDIA CEO Jensen Huang revealed that the company’s next-generation Vera Rubin NVL72 platform will be entirely liquid cooled and designed to accept 45-degree-Celsius inlet water, roughly 113 degrees Fahrenheit. At that temperature, the cooling loop can reject heat to the outside air through dry coolers or cooling towers without mechanical chillers, even in warm climates.
“The power of Vera Rubin is twice as high as Grace Blackwell… the water that goes into it is 45 degrees Celsius,” Huang said, according to NBC News. “No water chillers are necessary for data centers. Basically, cooling this supercomputer with hot water.”
The announcement triggered an immediate selloff in HVAC stocks. Johnson Controls fell 6.2 percent, Modine Manufacturing dropped 7.4 percent, Trane Technologies declined 4 percent, and Carrier Global slipped 1 percent. Baird analysts noted the disclosure “create[s] some questions and concerns” about future equipment orders, particularly for chiller systems.
Citigroup analyst Andrew Kaplowitz pushed back, arguing the selloff was “overdone” because Vera Rubin still requires liquid cooling infrastructure, including pumps, manifolds, coolant distribution units, and heat exchangers. What changes is the type of cooling, not the need for it.
Winners and Losers in the Transition
The distinction matters for understanding who benefits. Companies that manufacture mechanical chillers, which use energy-intensive vapor-compression cycles to produce cold water, face headwinds if the industry standardizes on warm-water direct liquid cooling. Companies that manufacture the liquid cooling plumbing itself, including the cold plates that attach to processors, the manifolds that distribute coolant across racks, and the coolant distribution units that manage flow and pressure, stand to gain.
This is precisely the market CoolIT occupies. Its direct-to-chip systems are already deployed in data centers operated by hyperscalers and colocation providers. Ecolab’s bet is that demand for this hardware will grow in lockstep with AI compute deployment, and that pairing it with Ecolab’s existing water treatment and management capabilities will create a vertically integrated offering.
Trane’s acquisition of LiquidStack hedges in a different direction. Two-phase immersion cooling, in which entire servers are bathed in a boiling dielectric fluid, can handle even higher heat fluxes than single-phase direct-to-chip systems. Dell’Oro projects immersion cooling will grow as chip-level thermal design power and thermal flux densities exceed what single-phase systems can manage, though it remains concentrated in pilot programs and early large-scale deployments.
The Market in Numbers
The data center liquid cooling market roughly doubled in 2025, reaching close to $3 billion in manufacturer revenue, according to Dell’Oro Group. The firm expects it to approach $7 billion by 2029. Single-phase direct liquid cooling remains the dominant architecture, supported by hyperscaler adoption and broad vendor investment. Two-phase and immersion systems are projected to expand gradually as accelerator thermal design power climbs.
The immersion cooling segment alone is forecast to reach $931 million in 2026 and grow at a compound annual rate of 27.1 percent through 2033, reflecting selective adoption where architectural trade-offs justify the additional complexity.
What Comes Next
The convergence of these trends points toward a near-term future in which liquid cooling is not an option but a requirement for any data center deploying current-generation AI accelerators. NVIDIA’s decision to design Vera Rubin around warm-water cooling, and to eliminate chiller dependency at the chip architecture level, effectively sets the thermal envelope for an entire generation of AI infrastructure.
For the cooling industry, the consolidation wave is likely not over. Dell’Oro identifies Vertiv, CoolIT, nVent, and Boyd as current market leaders, with Aaon demonstrating how deep hyperscaler partnerships can enable rapid market share gains. Smaller specialists in immersion cooling, rear-door heat exchangers, and coolant distribution may become acquisition targets as industrial conglomerates seek to assemble complete thermal management portfolios.
The strategic calculus has shifted. Cooling is no longer a commodity service bolted onto a finished data center design. It is an architectural decision made at the same stage as power delivery and network topology, one that determines which chips can be deployed, at what density, and at what cost.