All air conditioners that lower temperature operate in a similar fashion. First you take a gas, like Freon, and place it in a sealed system. This Freon is then pressurized using a compressor. As it is pressurized, it gets hot by absorbing the heat around it. This hot gas is then circulated through a series of tubes that dissipate the heat. Scientifically, the gas removes heat rather than adds cold, but that's a lesson in physics that doesn't really matter to us right now. The gas can lose lots of its heat. In other words it gets really cold, when you reduce the pressure. As it cools, it becomes a liquid. This is when you get cold air blowing which makes one more comfortable.

.