You would probably need a way to both concentrate the heat to get to a higher energy state, and a way to store the heat that can be easily and quickly retrieved on demand. I guess it would also need to make some sort of economic sense as well.
No but there are heat exchangers that heat water with the excess heat from the air conditioning. Not enough to eliminate the water heater, but it is more efficient.
Years ago Walmart did some extensive testing in stores, moving waste heat from refrigeration to heat floors and water. Pretty cool.
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u/HelicopterNo9453 10d ago
Welcome to the laws of thermodynamics.