Air conditioners use a specialized chemical called refrigerant and have three main mechanical components, which work together to quickly convert the refrigerant from gas to liquid and back again. These components are the compressor, the condenser coil and the evaporator coil. The compressor pressurizes the refrigerant into a hot, high-pressure gas, which then moves to the condenser coil, where it cools and condenses into a liquid. The liquid refrigerant then moves to the evaporator coil, where it evaporates into a gas and absorbs heat from the surrounding air, thus cooling it. The cool air is then blown back into the room, while the hot, low-pressure gas returns to the compressor to begin the cycle again.