system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: why is it so easy to make heat but so hard to make cold?
gpt
Heat is easy because you just need to do basically anything which will then add energy.  Light a fire.  Rub things together.  Whatever.

But you can't make cold.  That's not possible.  Instead, what you do is that you have to move the "heat" that is already there and move it somewhere else.  A fridge isn't making cold and adding cold, it's taking heat away and moving it somewhere else.  This is why the back of a fridge is so hot.  That's the heat that's been removed.  Compare that to turning on an oven.  Something else isn't getting cold.  You're not removing cold from the oven, you're adding energy.