Cool It Down
Building-Level HVAC & Cooling Systems
Supply Constraint
6/10How hard it is to add capacity in this layer. Suppliers, lead times, capital intensity, geographic concentration.
Demand Pull
8/10How much of this layer's revenue is AI-driven today and how fast that mix is growing.
Mandatory liquid cooling for AI racks. Vertiv backlog growing 100%+ YoY. Distinct from chip-level cooling (L10).
Layer Dependencies
Building-level cooling systems — chillers, cooling towers, CDUs — remove heat from the entire facility. This is distinct from chip-level cold plates (L10) which sit directly on GPUs. Vertiv, Carrier, and Trane supply these building-scale systems.
Deep Dive
The Liquid Cooling Mandate is this layer's entire story. Air cooling works up to roughly 40-50kW per rack. Current AI racks consume 70-120kW. Next-generation racks (GB300 NVL72) will push past 150kW. The physics is unambiguous: convective air cooling cannot remove enough heat at these densities. Every new AI data center being designed today includes liquid cooling infrastructure.
Vertiv Holdings is the dominant player — they make the cooling distribution units (CDUs), rear-door heat exchangers, and the end-to-end thermal management systems. Their market position is analogous to ASML's in lithography: not a monopoly, but the default choice with the deepest engineering integration with NVIDIA's rack designs.
The cooling system itself is a materials story. The coolant fluid is where Chemours (CC) appears — their Opteon and Freon lines include the dielectric fluorocarbon fluids used in direct-to-chip and immersion cooling. Solvay's Solef PVDF is used in cooling system piping and gaskets. The Liquid Cooling stretch we did traced the supply chain down to fluorspar (the raw mineral from which fluorine is extracted), controlled by Orbia and a handful of Chinese producers.
Johnson Controls, Carrier Global, Trane Technologies, and Ingersoll Rand compete in the broader HVAC market but are specifically targeting data center cooling as their highest-growth segment. Modine Manufacturing has emerged as a pure-play liquid cooling company for data centers.
The structural insight: liquid cooling converts a one-time capex item (air conditioning) into a recurring consumable (coolant fluid replacement, filter changes, pump maintenance). This shifts the revenue model from equipment sales to annuity-like services — good for the cooling companies, expensive for the data center operators.
Physics makes this non-optional: air cooling fails above 50kW/rack. Liquid cooling infrastructure is being designed into every new AI data center — no exceptions.
Companies in This Layer
Dominant in data center cooling and power. CDUs for liquid cooling. $15B+ backlog. S&P 500 inclusion March 2026. Growing 109% YoY.
Data center cooling specialist (Airedale brand). CDUs, chillers, precision air handling. DC sales +78% YoY. $2B DC revenue target by FY2028.
Diversified building HVAC, chiller, and automation systems. York chillers specified in hyperscale data centers. $18.2B record backlog driven by data center cooling demand.
Precision cooling systems for data centers. Chiller technology for large facilities.
World's largest pure-play HVAC company pivoting toward data center cooling via NVIDIA reference design, LiquidStack (immersion), and Stellar Energy (modular liquid-to-chip) acquisitions.
Electrical enclosures and thermal management. Collaborating with NVIDIA on GB200 cooling. Spans L17 + L19.
Compressed air and thermal management. Industrial cooling components.
Industrial heating and cooling solutions — liquid load banks for data center cooling validation and thermal management systems for critical infrastructure.