In 2026 the HVAC industry is being pulled in two directions at once: an unprecedented surge in cooling demand from AI and cloud data centers, and tightening global regulations that push new equipment toward low-global-warming-potential (low-GWP) refrigerants. For component suppliers — valve manufacturers, actuator makers, and controller specialists — the result is a market that is growing fast but also changing faster than ever. This update looks at what actually changed, the numbers behind the shift, and what component buyers should be asking their suppliers for.
How Big the Cooling Load Actually Got
The scale jump is easiest to see per rack. Industry surveys put the modal rack density in existing facilities around 10 kW, with liquid cooling generally considered necessary or justified from roughly 20–30 kW per rack (Uptime Institute data). AI clusters skip straight past that range: the ASHRAE, NEMA, and PNNL AI Data Center Energy Performance Framework describes GPU clusters driving 40–100 kW per rack versus 5–10 kW in legacy CPU racks, and calls for dedicated technology cooling wherever densities routinely exceed 50–120 kW per rack.
Air has a hard ceiling, and ASHRAE TC 9.9 has put numbers on it: a 40–50 kW rack would need up to 5,000 cfm of airflow, with fan power alone at least 5 kW — ten percent of the rack’s power spent just moving air before any heat is rejected. That is why direct-to-chip liquid cooling has moved from niche to mainstream for AI training clusters, while everything around the racks — room air, chillers, economizers, heat rejection — still has to be controlled, modulated, and proven.
The energy stake is not small. Cooling and power distribution losses accounted for roughly 31% of U.S. data-center electricity use in 2024, per Lawrence Berkeley National Laboratory’s analysis, and surveys commonly attribute 30–40% of a facility’s energy consumption to cooling.
Air Still Runs the White Space
Liquid cooling removes heat at the chip, but the room still breathes. Most facilities live in a mixed regime for years: liquid-cooled AI rows alongside air-cooled storage and networking rows, containment systems separating hot and cold aisles, and CRAH units modulating to hold room conditions. ASHRAE’s recommended envelope for IT equipment inlet air remains 18–27 °C (64.4–80.6 °F) for most classes — a band that has to be held while rack loads swing with training schedules.
That is classic airside control work, and it is where standard HVAC components carry data-center duty:
- Outdoor-air and exhaust dampers on economizer cycles need actuators that modulate cleanly and hold position against wind and stack pressure — the same damper actuator selection rules as commercial HVAC, with tighter uptime expectations.
- Containment and bypass dampers re-balance airflow as rack loads change; they fail safe or they cause hot spots.
- Differential-pressure and temperature sensors give the control loop something honest to act on; sensor drift shows up as fan energy long before it shows up as an alarm.
For engineers new to the actuator side, our Damper Actuators 101 covers torque, signal, and feedback selection.
Liquid Changes the Valve and Sensor Specification
Wherever chilled water or a technology cooling loop appears, the component spec shifts in three ways:
- Response and stability. Tight supply-temperature control (±0.5 °C-class) needs modulating valves with repeatable stroke — not oversized two-position valves cycling on deadband.
- Working pressure and temperature. Warmer chilled-water/coolant loops raise the efficiency ceiling but change valve and sensor ratings; check them per loop, not per catalogue habit.
- Sensor density. Loop balancing and CDU monitoring push toward more measuring points — supply/return pairs per loop, differential-pressure across strainers and exchangers.
The valve-side basics — port configuration, Kv, actuator pairing — carry over from commercial practice; see our electric valve range and this guide to electric versus solenoid valves for the selection logic. For the control-layer context — what the BMS actually sees and commands — our HVAC control system primer applies to data centers with almost no translation.
Low-GWP Refrigerants: The Other Half of the Story
While rack densities climb, the refrigerant side of the industry is going through its own transition. Building on the EU F-Gas phase-down and similar measures elsewhere, 2026 sees low-GWP A2L refrigerants becoming the default specification for much new equipment. These fluids change the rules for pressure ratings, leak detection, and charge limits — which in turn affects how valves, sensors, and safety accessories are selected. We keep a running summary of the 2026 rule changes and the common misunderstandings in our refrigerant rules update; the practical takeaway for component buyers is simple: pressure and safety accessories must be selected for the refrigerant that will actually be in the pipe, not the one that was there five years ago.
What Component Buyers Should Ask For in 2026
| Ask | Why it matters for data-center duty |
|---|---|
| Protocol-ready control (Modbus/BACnet where applicable) | Facility BMS integration and monitoring are mandatory, not optional |
| Documented torque/Kv/sensor accuracy | Data-center commissioning is evidence-driven; undated catalogue claims don’t survive it |
| Continuous feedback on modulating devices | Tight (±0.5 °C-class) loops need real position and value proof |
| Correct pressure/temperature ratings for the loop or refrigerant | Warmer coolant loops and A2L transitions both change the rating sheet |
| Fail-safe behavior defined per device | Economizer and containment dampers must reach a safe position on power loss |
The 2026 Numbers at a Glance
| Figure | Value | Source |
|---|---|---|
| Legacy enterprise rack density | 5–10 kW / rack | ASHRAE / NEMA / PNNL framework |
| AI GPU-cluster rack density | 40–100 kW / rack | ASHRAE / NEMA / PNNL framework |
| Where liquid cooling becomes justified | ~20–30 kW / rack | Uptime Institute |
| Airflow for a 40–50 kW air-cooled rack | up to 5,000 cfm (≥5 kW fan power) | ASHRAE TC 9.9 |
| Recommended IT inlet air | 18–27 °C | ASHRAE thermal guidelines |
| Cooling + power losses, U.S. data centers (2024) | ~31% of electricity use | Lawrence Berkeley National Laboratory |
FAQ
Does liquid cooling eliminate the need for airside HVAC in data centers?
No. Direct-to-chip loops pick up most of the processor load, but 25 kW or more can still be rejected to air per rack in hybrid rooms, and the room itself — containment, economizers, humidity, heat rejection — still needs modulating dampers, valves, and sensors. Airside work shifts in mix; it does not disappear.
Are data-center damper and valve selections different from commercial HVAC?
The physics is the same; the expectations are not. Data-center sequences demand continuous feedback, defined fail-safe positions, documented ratings, and protocol integration for monitoring. Components that pass in a comfort application can still fail the commissioning evidence checklist.
Do A2L refrigerant rules affect airside components?
Directly, no — dampers and airside sensors don’t touch refrigerant. Indirectly, yes: leak-detection requirements and pressure-rated accessories around the refrigerant circuit change, and any component specified near that circuit needs its ratings checked against the new fluids.
Outlook
The two trends converge on the same conclusion: the winners in 2026 are not the cheapest components but the most compliant and the most integrable ones. Data-center work rewards suppliers who can document ratings, speak the BMS’s protocol, and modulate precisely; the refrigerant transition rewards the same discipline on the safety side. Suppliers that treat AI cooling as ordinary HVAC with bigger numbers will ship components that work — but the projects that commission cleanly will be the ones specified with data-center duty in mind from the start. For the system-level view of how these components fit a large project, see our selection guide for large and complex projects.
Sources
Primary documents behind the standards, regulations and figures in this article. Links open in a new tab.
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