Using a set of cold pipes, known as evaporator coils, an air conditioner strips the incoming air of its heat, allowing for the air to be cooled. The evaporator coils contain a liquid, known as refrigerant, which changes into gas form once it has pulled the heat out of the air. The gas then moves to a condenser, which is another coil located on the outside, where it then exchanges its heat and becomes converted back into a liquid. A compressor aids in moving the gas between the two coils, as well as monitoring the pressures in each coil. A motor provides the energy required to allow for this system to propel.