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Triple digits. Air conditioning works well and is more energy efficient than heating.
My apartment is built in such a way that it doesn't need heating. We had -20C last winter and didn't need to have the heating on.
Unless you're homeless. Or like, a lot of animals.
Only for inductive heating. A heat pump is basically the same as an AC in reverse.
Ah, but you also have to consider the amount of heating and cooling you’re doing. Assuming that you’re comfortable at a normal room temperature of 70F, that’s 30 degrees of cooling from triple digits, but 61 degrees from single. And, you’re also going to want to take into consideration the heat of fusion of water as you are melting whatever ice comes which raises the amount of energy required even more.
Triple digit Kelvin is already quite comfortable.