[sundars]

One of the most important fact form this article which is likely to be overlooked is : "the Prineville facility runs at 85°F with a 65 percent relative humidity". Running at such a high humidity + Temp combination is impressive esp when you look at the money saved in environmental costs.

[chopsueyar]

That quote made it seem like the incoming air was at 65% relative humidity, but...

"which in turns lets Facebook rely on evaporative cooling instead of air conditioning."

So it runs at 65% relative humidity after the swamp coolers.

I doubt this would be possible in datacenters in more tropical environments (south Florida). Thoughts?