* Your air conditioning unit uses chemicals that convert from gas to liquid and back again quickly. These chemicals transfer the heat from the air inside your property to the outside air. The AC unit has three key parts. These are the compressor, the condenser, and the evaporator. * Air conditioners can be used as a heating units but only if they have heat pump. If not, when your air conditioner reaches the room temperature it'll simply stop blowing air and go in "sleep" mode. The heating and cooling systems might cost a bi more, but they surely are a great investment. * Your air conditioner is designed to cool a maximum of 20 degrees from the temperature outside. Pretty simple math. If it's 100 outside, and you're getting below 80 inside, your A/C is doing it's job.