Changing your air filters on-time is similar to getting an oil change for your car. The longer you wait between changes, the more damage you can do. It's a mandatory maintenance item to keep your heating and cooling unit working smoothly. Replacing your HVAC air filters every few months is a small price to pay rather than replacing your HVAC for thousands of dollars! Read more about how dirty air filters can impact your HVAC system. Regular filter changes also keep your indoor air clean by filtering out particles such a dust, dander, pollen, and even virus carriers.