You should clean your air conditioner if you want to lower your energy costs. If you don’t clean your AC unit, it will not be able to work as efficiently as it should. That will cause you to use more energy than you have to, which will cost you more money in the long run. Besides that, an unclean AC unit is a breeding ground for bacteria, molds, and other microorganisms that can cause illnesses in people in close contact with the unit.