How does Air Conditioner emits cold/hot air?
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When you use a spray can a lot, it gets cold.
You *can* use a spray can for cooling, but spray cans are usually intended for other purposes (such as painting).
An air conditioner is basically a spray can that sprays into a metal tube. The tube gets cold, and there’s a fan that blows air over the cold tube. That’s what makes the air cold.
The biggest problem with spray cans is they run out. Except in an air conditioner, the spray can is self-refilling: The metal tube leads to a pump, and the pump keeps the spray can full and pressurized.
Another issue is the physics works in reverse, too: A gas that has its pressure released and expands gets cold, but a gas that’s pressurized by a pump and squeezed back into a spray can gets hot, in theory equal and opposite (but in practice the pumps we actually build in the real world aren’t 100% efficient and create extra heat from friction and electrical resistance).
So you handle this by having the hot, newly pressurized gas go through some outdoor tubing, and another fan to blow outside air across it.
In other words, the pump and the spray nozzle divide the loop of metal tube into two sections: A cold low-pressure section after the nozzle, and a hot high-pressure section after the pump. Blowing air over the cold section moves heat from the room to the tube, blowing air over the hot section moves heat from the tube to the outdoors. An air conditioner doesn’t destroy heat, it just moves heat from indoors to outdoors.
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