1750
Ancient Iran had air conditioning
(lemmy.world)
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AC really doesn't consume that much if designed and sized properly. It's nothing like the energy consumption of standard heating. The problem is all these people going out and buying the cheapest floor unit or undersized window unit they can find, then the wheezing thing just sits there chugging 100% of the time because it can't keep up with their space. That's super wasteful.