At the servers
Pick up the heat
Air or liquid cooling captures heat at the equipment.
Data center & server room cooling · New York City
Data center cooling in NYC that keeps critical IT online
Denair designs, installs, and maintains precision cooling for IT closets, server rooms, data centers, and AI racks across all five NYC boroughs. We plan for the failure case first.
Cooling down right now? 24/7 service line: (212) 365-5115
19 yrsNYC commercial HVAC experience
<4 hrPriority response SLA
5Boroughs, one dispatch line
Airflow pathSupply → rack → return
The short answer
Why comfort cooling is not enough for an IT room
IT rooms and data centers need precision cooling built for 24/7 operation, tight temperature and humidity control, and backup redundancy. Comfort HVAC is designed for people, not for a constant, concentrated heat load.
Control the airflow before paying to create more cooling.
Containment, blanking panels, and verified rack-inlet readings can expose stranded capacity before you add equipment.
Application selector
Match the cooling architecture to the IT load
Room size alone does not pick the system. Load, density, airflow, utilities, growth, and redundancy do.
Starting point
Enter a load to see where to start
Or scan the table below.
Planning guide only. Final selection follows a measured load and engineering review.
| Typical load | Cooling architecture | Platforms commonly evaluated |
|---|---|---|
| Under ~30 kW | IT closets and small server roomsDedicated DX, wall or ceiling-mounted, or compact precision cooling. | Mitsubishi Electric, Daikin, Vertiv Liebert, Data Aire, Schneider/APC, Rittal |
| ~30–200 kW | Mid-size enterprise server roomsCRAC, CRAH, in-row, and containment with staged redundancy. | Vertiv Liebert, Schneider Electric, STULZ, Airedale (Modine), Data Aire |
| 200 kW and up | Large data centersChilled-water CRAH, chillers, pumps, controls, and heat rejection. | Cooling: Vertiv, Schneider, STULZ, AiredaleChillers: Trane, Carrier, York (Johnson Controls), Daikin |
| High density | AI, GPU, and HPC racksLiquid cooling: rear-door, CDU, direct-to-chip, or hybrid air/liquid. | CoolIT, Asetek, LiquidStack, plus Vertiv and Schneider CDUs |
Load bands are planning guides. Denair is factory-certified on Trane, Carrier, Daikin, and Mitsubishi Electric equipment; other platforms are commonly evaluated, with no certification or exclusivity implied.
The complete thermal path
How heat leaves your data center
Cooling works in four connected steps. If any one falls short, racks run hot.
Across the room
Move it away
Air, refrigerant, or water carries it away from the racks.
In the mechanical room
Pass it to the building
Cooling equipment transfers it to the building system.
At the roof or yard
Send it outside
Condensers, dry coolers, or towers release it outdoors.
CRAC or CRAH?
Choose by infrastructure, scale, and risk
A CRAC (computer room air conditioner) carries its own refrigerant cycle. A CRAH (computer room air handler) uses chilled water from a central plant.
| Factor | CRAC | CRAH |
|---|---|---|
| Cooling source | Built-in DX refrigerant cycle with compressor | Chilled-water coil, no compressor |
| Typical fit | Smaller loads, up to about 200 kW | Larger loads, from about 200 kW |
| Needs | Outdoor condenser or heat-rejection path | Central chilled-water plant and piping |
| Scales best | Rooms and distributed sites | Large halls and campus growth |
Redundancy
Plan for the unit that is offline, not just the one that is running
Redundancy decides what your room does during a fault or a service window.
Capacity for the load
Exactly the cooling the load needs. Any unit offline can push rack inlets out of range.
One spare unit
One spare unit, so a single unit can be down while the room holds its target.
A fully duplicated system
Two independent systems, each able to carry the full load.
Redundant on paper is not redundant in practice. Denair verifies failover during scheduled maintenance, so you know the backup engages before you need it.
High-density transition
Hybrid cooling keeps the upgrade proportional to the workload
Most facilities do not need liquid on every rack. Keep air for standard racks and add liquid only where AI and GPU servers concentrate heat.
The design question is not “air or liquid?” It is where heat should be captured, how it moves through the facility, and which systems must stay available during maintenance or a fault.
Full lifecycle support
One mechanical partner from load study to emergency response
Denair coordinates the mechanical, airside, controls, and commissioning work that keeps the whole heat-removal path accountable.
Heat-load and capacity planning
Map IT loads, rack density, and growth to set operating and standby capacity.
Installation and replacement
Precision units, chillers, piping, controls, and phased cutovers.
Containment and distribution
Hot and cold aisle separation, return-air capture, and raised-floor delivery.
BMS monitoring and alarms
Sensors, lead-lag sequences, trend data, and high-temperature alarms.
Testing and commissioning
Verify airflow, temperatures, alarms, and operation with equipment out.
Preventive maintenance and 24/7 repair
Maintenance built around runtime and redundancy, starting from $396/year, with emergency repair from a team that already knows your cooling chain.
Built-in compliance
Always-on IT cooling belongs in your NYC compliance plan
IT cooling runs every hour of the year, so its energy use counts. Denair Annual Contracts include LL97 documentation.
See LL97 compliance services- LL97Local Law 97 caps emissions for large buildings. Well-tuned, well-maintained cooling helps keep energy use in check.
- NYC HealthCooling towers: Legionella sampling at least every 31 days while operating, hyperhalogenation 1 Jul–31 Aug with a follow-up test, and 3 years of records (rules amended 8 May 2026).
Service area
Data center and server room cooling across all five boroughs
One dispatch line and one accountable team across all five boroughs.
Manhattan
Computer room AC in ManhattanData center HVAC repair in ManhattanBrooklyn
Computer room AC in BrooklynQueens
CRAC unit repair in QueensData center HVAC repair in Long Island CityThe Bronx
Staten Island
Questions, answered
Data center cooling FAQ
Direct answers for facilities and IT teams planning critical cooling in NYC.
What is the difference between CRAC and CRAH cooling?
A CRAC (computer room air conditioner) has its own refrigerant circuit and compressor. A CRAH (computer room air handler) uses chilled water from a central plant. CRAC suits loads up to about 200 kW; CRAH is generally the fit from about 200 kW, where a chilled-water plant exists or can be built.
What temperature should a data center or server room maintain?
ASHRAE's recommended air-inlet temperature range for common A1 through A4 air-cooled IT equipment is 64.4°F to 80.6°F (18°C to 27°C). The target should follow the installed equipment's requirements and be measured at the rack inlet, not selected from room temperature alone.
What humidity should a data center maintain?
ASHRAE manages moisture by dew point, with a recommended range of about -9°C to 15°C (15.8°F to 59°F) for common air-cooled IT equipment. Too dry raises static risk; too humid raises condensation risk. Precision cooling holds both steady around the clock.
Does a server room need dedicated precision cooling?
Usually, yes, when the IT load runs continuously, the equipment is business-critical, or building HVAC scales back after hours. Precision cooling is built for year-round heat removal, rack-inlet control, monitoring, and backup capacity.
What do N+1 and 2N redundancy mean for cooling?
N is the cooling the load requires. N+1 adds one spare unit, so the room holds its target when one unit is down. 2N is a fully duplicated, independent system. Distribution, controls, power, and heat rejection must match the design, so test failover rather than assume it.
When should a facility consider liquid cooling?
Consider liquid or hybrid cooling when AI or GPU racks, airflow limits, or persistent hot spots make air-only cooling impractical. Rear-door heat exchangers, CDUs, and direct-to-chip systems can be added to dense racks while standard racks stay on air.
How much does server room cooling cost?
Cost depends on IT load, redundancy, architecture, heat rejection, building access, and utility upgrades. Denair preventive maintenance starts from $396/year, scoped to your equipment. Installation is priced after a load and site assessment.
Does Denair provide data center cooling service across NYC?
Yes. Denair supports data center, server room, and precision cooling projects in Brooklyn, Manhattan, Queens, The Bronx, and Staten Island: design, installation, maintenance, controls, testing, and 24/7 emergency response. Cooling down now? Call (212) 365-5115.
Start with the operating risk
Build a cooling plan around your IT load and uptime requirement
Bring Denair in for a new room, an upgrade, a recurring hot spot, or an emergency. Visit DenairHVAC.com or call us directly.
Main office(212) 776-1333
24/7 service dept.(212) 365-5115
Office8319 20th Ave., Suite 200, Brooklyn, NY