To make sure your HVAC system is ready for the season, you should get a tune up before you use your air conditioner, furnace, or other heating and cooling systems. You can save a lot on your utility bills by keeping your system operating at peak efficiency by scheduling a spring AC tune up and a fall furnace tune up twice a year. By identifying and fixing small problems before they become bigger problems, you can also avoid costly repairs. It is also important to note that many homeowners do not realize that if their unit isn't serviced twice a year with a furnace or AC tune up, their manufacturer's warranties could be voided.