- Just like people, machines have "body" temperatures, too...
When you’re responsible for running a data center, you quickly realize that cooling isn’t just another maintenance item – it’s the backbone of your entire operation. Servers generate enormous amounts of heat, and even a short spike in temperature can lead to throttling, hardware failure, corrupted data, and costly downtime. Keeping everything cool, efficient, and stable becomes part of your daily routine.
The good news? You have more cooling strategies available today than ever before. And with the right setup, you can protect your equipment, extend its lifespan, and cut energy costs at the same time.
Knowing this, here are six of the best ways to keep a data center cool.
- Use Hot Aisle/Cold Aisle Containment to Control Airflow
One of the most effective cooling strategies is proper airflow management. Without it, cold air mixes with hot exhaust, temperatures fluctuate, and your systems have to work harder than they should.
Hot aisle/cold aisle containment creates a predictable airflow pattern. You position server racks so cold air intakes face one aisle and hot air exhaust faces the other. Cold aisles pull in cooled air and hot aisles collect the heated discharge. With this setup, you reduce mixing and improve efficiency.
Some facilities take this further by installing physical barriers to trap air in each aisle. Whether you choose full containment or a basic layout, the goal is the same: guide air where it needs to go and prevent it from drifting where it shouldn’t.
- Use Water Chillers for High-Density Cooling Needs
As data centers grow and workloads become heavier, traditional air cooling sometimes isn’t enough. That’s where water chillers step in. They’re one of the most powerful tools you can use when you’re dealing with dense racks, demanding workloads, or limited physical space.
Water chillers use chilled liquid – usually water or a water-glycol mix – to absorb heat from your equipment. Because water transfers heat more efficiently than air, you can remove large amounts of heat quickly without overworking your HVAC units.
Water chillers connect to cooling coils, in-row coolers, or rear door heat exchangers, giving you flexibility in how you deploy them. If you’re scaling fast, they can give you the capacity you need without rebuilding your entire layout.
- Incorporate Liquid Cooling
While water chillers cool the air around your systems, liquid cooling takes things even further by bringing coolant directly to the components generating heat. For ultra-high-density racks or AI workloads, liquid cooling is becoming the standard because it removes heat at the source.
There are two common approaches:
- Direct-to-chip cooling, where coolant circulates through plates that sit directly on processors and other heat-producing parts.
- Immersion cooling, where entire servers are submerged in a nonconductive liquid that absorbs and transfers heat with incredible efficiency.
If you’re preparing for extreme workloads – think machine learning models, high-frequency trading, or advanced simulations – liquid cooling gives you stability where air systems start to fall short.
- Keep Your Layout Flexible as Technology Evolves
As your equipment evolves, your cooling needs shift. That’s why flexibility is essential. A rigid layout might work for now, but if you adopt higher-density servers or expand your facility, you’ll need the freedom to change equipment placement, reroute airflow, and adjust cooling capacity.
Consider using modular cooling solutions, movable in-row coolers, or scalable chillers. These allow you to adapt without shutting down operations or redesigning the entire center. Flexibility also helps you respond to unexpected issues – when a particular rack starts running hotter than expected, for example, you can adjust without major disruption.
- Monitor Everything, Always
Cooling only works if you’re tracking what’s actually happening inside your facility. That’s where monitoring becomes indispensable. Sensors give you real-time data on air temperature, inlet temperature, humidity levels, exhaust heat, differential pressure, and more.
With that information, you can spot problems before they escalate. A failed fan, a blocked vent, a malfunctioning CRAC unit – you’ll catch these quickly when your monitoring system alerts you to abnormal conditions.
- Raise the Temperature
It may feel counterintuitive, but you don’t always need your data center to feel like a walk-in freezer. Many facilities still keep server rooms far colder than necessary, which wastes energy and strains cooling systems.
Modern hardware is built to tolerate higher temperatures than past generations of equipment. ASHRAE guidelines recommend temperatures between 64 and 80 degrees Fahrenheit for most server environments. Staying on the warmer end of that range can substantially cut cooling costs without risking hardware.
Of course, you still need monitoring sensors to make sure individual racks aren’t overheating, but raising the baseline temperature gives you more flexibility and less strain on your cooling systems.
Stay Cool
As you can see, there are plenty of options when it comes to cooling a server room or data center. The key is to understand your needs and adjust over time to meet changing demand. And if you support your efforts with the right cooling technology, it makes everything much easier.