this post was submitted on 16 Sep 2026
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They use evaporative cooling on the AC that actually cools the inside of the data center. Evaporating water cools things down significantly more than simply splashing cold water at them.
This significantly reduces their costs on electricity because AC runs much more efficiently when the condenser side is cool.
They do not (usually) use evaporative cooling on the GPUs themselves. Evaporative cooling is used more directly too, but the indirect variant is better because it doesn't raise the humidity inside the data center. This is why so many data centers are being built in deserts now (well this and the cheap land).
When they do use it without the heat pump/AC in tandem, then it means pushing hot air through a water soaked membrane, not using all that water in the coolant pipes for the servers. The closed loop is still closed, the evaporation happens outside of the loop.