If your thermostat serves as the “brain” of your air conditioning system, then the compressor serves as its “heart.” The compressor and condenser are housed in the outside component of your cooling system—this is called the condenser unit. Your compressors job is to add pressure to the refrigerant that it receives from inside your home to increase its energy as well as its temperature.
At that point, refrigerant leaves the compressor as a hot, high pressure gas that flows into the condenser, which has metal fins that help the heat dissipate. From here, the temperature of the fluid has considerably cooled and changed from a gas back to a liquid. The liquid goes into the evaporator and the pressure drops. The refrigerant then begins to evaporate back into a gas, extracting heat from the air around it, and cooling your home.