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Oxford study proves heat pumps triumph over fossil fuels in the cold
(www.nationalobserver.com)
This is a most excellent place for technology news and articles.
Heat pumps are A/C in reverse. It makes total sense instead of using fire to heat air.
brb putting in my window unit from the outside
You'd need to collect the condensate, but that would actually work quite well.
Also most of the electronics on the cold side aren't designed to be exposed to the elements, so that would be a problem