An air conditioner is like a personal trainer for your air. Sometimes air gets lazy and just want to sit around the house all day. Turn on your air conditioner. It will start motivating the air in it’s own language. It will say things like “You are getting fat, lazy air. 10 laps around the house. You think you are special? There are 10 airs outside right now who would kill to have your job.” To us humans, this language sounds like a low hum.