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On the energy front, Intel claims that each 1C increase in data center temperature results in a 4% savings in energy cost. That's pretty significant, and a solid motivation for increasing temperature as long as it can be done safely. A big part of that is a comprehensive monitoring system, something that Intel is making easier with server chips that include temperature sensors. If you can use the data to create accurate models that reflect hot and cold spots in your data center, you can improve the efficiency of your cooling system by planning the placement of IT equipment for efficient cooling without adding cooling capacity. Facebook runs its data centers at 27C (80.6F), with apparent reliability, so if you could approach that from your current 20C (68F), your company could see nearly a 30% decrease in energy consumption at your data center. While you might not want to go to 27C, I think many companies data centers are at a little warmer than your 20C without any problems.