Tips for Fixing Your Central Air Conditioner When it comes to a central air conditioner, many people have the idea they are extremely complicated little machines. In reality, they are really easy to learn and have very basic parts that make them work. There are 3 major parts that makes an air conditioner work. Two are on the outside (compressor and condenser) and one is on the inside (evaporator). These parts pull together to pump air into the home, cool it down, and then evaporate any water formed throughout the process. Air conditioners run on Freon, like the ones in your car. Freon is an extremely volatile liquid used for cooling and heating, and it goes into your air conditioner compressor. The compressor then squeezes the Freon until it transforms into a gaseous state, which is extremely hot. That heat gets forced out of the air conditioner by a rotating fan. The Freon then cools down very rapidly and returns to its former liquid state. The rotating fan ensures that hot air gets forced out, while the cooler air gets pumped out into your room. This is how your central air conditioner cools your room down quickly.