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2026-06-12 — views $VRT · Vertiv Holdings · Data center thermal management / heat rejection

Vertiv closes ThermoKey acquisition — adding dry coolers and microchannel heat rejection to its AI data center thermal stack

Vertiv closed its ThermoKey S.p.A. acquisition on June 12, adding Italian-made dry coolers and microchannel heat-rejection to its AI-factory thermal portfolio. The deal extends EMEA manufacturing and positions Vertiv for GPU-cluster liquid-cooling density demands.

What closed

On June 12, 2026, Vertiv Holdings completed its acquisition of ThermoKey S.p.A., a privately held Italian manufacturer of industrial heat exchangers headquartered in Remedello, Brescia. ThermoKey specializes in dry coolers — air-cooled heat rejection systems that move heat from liquid cooling loops to the ambient air — and microchannel heat exchanger technology for high-efficiency heat rejection at data center scale.

The deal terms were not publicly disclosed. ThermoKey employs approximately 200 people across manufacturing and engineering in Italy, and has built its reputation supplying cooling infrastructure to data centers and industrial process plants across Europe and the Middle East.

Why heat rejection is the 2026 bottleneck

The AI GPU era has flipped the thermal physics of data centers. A standard server rack in 2019 dissipated 10–15 kW. A rack of NVIDIA H100s dissipates 50–60 kW. A rack of B200s or GB200 NVL72 nodes can exceed 100–120 kW per rack. The cooling chain for this load has two parts:

  1. In-rack liquid cooling (cold plates on CPUs/GPUs, rear-door heat exchangers) — Vertiv was already strong here
  2. Heat rejection to the outside (dry coolers, cooling towers, fluid coolers that dump heat to ambient air or water) — this is what ThermoKey adds

The second part is the constraint that building operators most often underestimate. You can plumb a building with liquid cooling loops, but unless you have sufficient heat rejection capacity on the facility roof, grounds, or parking structure, you cannot cool the loop — and you cannot run the racks at rated power. At 100 kW/rack, a 50-rack AI cluster requires 5 MW of heat rejection capacity sitting outside the building. That is physical infrastructure that takes months to procure and install, and it is specifically where ThermoKey’s product line sits.

ThermoKey’s technology

ThermoKey’s core products are:

Dry coolers (fluid coolers): Liquid-to-air heat exchangers that circulate hot facility water through finned coils while fans blow ambient air across them. They reject heat without consuming water (unlike cooling towers), which matters in water-stressed European jurisdictions and in regions with water-use restrictions.

Microchannel heat exchangers: A denser tube geometry that increases surface area per volume, enabling higher heat rejection capacity in a smaller physical footprint. Relevant for sites where rooftop or outdoor space is constrained — urban hyperscale campuses in particular.

Free cooling integration: At ambient temperatures below the facility setpoint (typically Oct–Apr in Northern Europe), dry coolers can reject heat without mechanical refrigeration at all — essentially zero-energy-cost cooling. ThermoKey’s controls portfolio includes integration with building management systems to optimize free-cooling hours.

Strategic fit for Vertiv

Vertiv’s thermal management portfolio before the acquisition covered: in-row coolers, precision air coolers, liquid cooling distribution units (CDUs), and rear-door heat exchangers. The gap was the external heat rejection link — the step after the CDU where hot facility water leaves the building.

With ThermoKey, Vertiv can now sell a complete thermal chain from in-rack cold plate or CDU through facility-level pumping infrastructure to outdoor heat rejection — all from a single vendor. That matters to data center operators who prefer integrated single-vendor thermal design accountability over multi-vendor coordination at every interface.

The EMEA manufacturing dimension is also strategic. ThermoKey’s Remedello facility gives Vertiv EU-based production for a product line that is otherwise costly to ship from its existing US, India, and Asia manufacturing sites. European hyperscaler data center build-out (Microsoft, Google, and AWS are all expanding across Germany, France, the Netherlands, and the Nordics) creates a near-term demand pull for locally manufactured heat rejection equipment.

The AI cooling arms race

The ThermoKey acquisition is one of several thermal-infrastructure M&A moves in 2025–2026:

The competitive dynamic is straightforward: AI cluster power density is growing faster than cooling technology roadmaps. Any manufacturer that can deliver proven, scalable heat rejection capacity in a 12–18 month procurement cycle is supply-chain-constrained before it is demand-constrained.

Practitioner note

For data center operators planning AI cluster expansions: the ThermoKey acquisition is a signal that Vertiv is betting the heat-rejection link is the next supply constraint in AI infrastructure buildouts. If you are designing a facility for 100 kW/rack GPU clusters, the lead time on outdoor heat rejection equipment (dry coolers, cooling towers, adiabatic systems) is where your project schedule will slip, not the servers themselves. The procurement window for heat rejection needs to open 18–24 months before rack power-on — which means if you are targeting a 2027 GPU cluster, the heat rejection design should be locked in 2025 (already late) or at latest mid-2026. Vertiv acquiring ThermoKey does not shorten your lead time, but it does mean Vertiv can now quote and deliver the full thermal stack rather than referring you to a third party for the last mile.

Under-considered angle

The regulatory dimension of data center cooling is almost entirely absent from technology coverage. European data centers above 1 MW are subject to the EU Energy Efficiency Directive and increasingly to national water-use regulations that effectively penalize cooling-tower-based designs in water-stressed areas. Dry coolers — ThermoKey’s core product — are the compliant alternative in these jurisdictions, which creates a structural regulatory tailwind in Europe that does not exist in the U.S. to the same degree. Vertiv’s acquisition of a European dry-cooler manufacturer in 2026 may look retrospectively like a well-timed regulatory bet as much as a thermal-technology play.

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