why is it easier to heat things up, than it is to cool them down?
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In addition to the other comments, understand that heating things up and cooling them down is an EXCHANGE of heat. A really simple way to explain an AC unit is that air passes over super cold coils, the coils pull the heat in from the air, and the cold air blows into your house.
When chemical reactions (like fire) or hot stove tops heat something, they’re applying heat directly to what needs to get hot. It’s easy to get the molecules agitated.
But when things cool they have to exchange the heat with the ambient air around it, which can take a while. You can witness this yourself by seeing how long it takes a pan to cool down on the stove vs in the freezer. The colder the air around it, the more heat it can pawn off
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