Squeeze gas -> gas gets hotter
Unsqueeze gas -> gas gets colder
Air conditioners squeeze a gas, freon, outside your house. The freon gets hot, but the surrounding air cools it down. Then the A/C pumps the freon inside your house and unsqueezes it. Now the freon is cold, and it cools down the air inside your house. Then the freon is pumped back outside and the whole thing starts over.
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