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What Happens When Facebook Heats Your Home
(www.wired.co.uk)
This is a most excellent place for technology news and articles.
A heat pump still costs energy to run... And running it in reverse to cool a room is the exact same process as running an ac to cool a room. It's all phase change cooling which we've been doing for decades. The only possible innovation that could be had here is using the waste heat instead of just releasing it to the outside environment, but that requires wanting to heat something else while you need to cool the server room.