eli5 What is it that makes air conditioning more challenging than heating?
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It’s easy to pump energy into a system to create heat. There are many ways to do it. All mechanical action produces some heat as a byproduct due to friction anyway. Even an AC does. It’s much trickier to get energy out of a system so much that it is substantially cooler than ambient temperatures. How many ways can you think of to do it? I can only think of a couple to be honest. The trick is to take heat from one place and release it in another in a repeatable and rapid way without adding heat to the system you are trying to cool.
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