Air at -40 degrees is still +273 degrees Kelvin! That’s a lot of heat that can be pulled out!
Heat pumps work just like air conditioners, (or your fridge.) The only difference is that they have a valve that allows them to push the heat in either direction. So it would be like a fridge that can make the inside either hot or cold.
Because they’re not converting energy into heat, rather using the energy to gather and move existing heat, the effect can be many times more efficient.
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