A tune-up has several positive effects on an Air Conditioner Any device that can change the temperature, humidity or general quality of the air. More specifically, an air conditioner makes your home cooler, by drawing heat energy out of the house and transferring that heat to the outdoors " data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]">air conditioner. After a tune-up appointment, the Air Conditioner Any device that can change the temperature, humidity or general quality of the air. More specifically, an air conditioner makes your home cooler, by drawing heat energy out of the house and transferring that heat to the outdoors " data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]">air conditioner  will perform more efficiently and significantly improve indoor air quality. In addition, homeowners can expect reasonable energy bills each month even if their air conditioners work extensively throughout the season.