if you think about it, electric heaters are the only thing that can be 100% efficient
and yet we've still managed to make a better version of them with heat pumps
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if you're wondering how you do better than 100%: it's the realization that it doesn't take anywhere near as much energy to *move* heat as it does to *produce* it, so you just move heat from a place you don't need warm (like outside) to the place that you do want to be warm (like inside your apartment)
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