Ask an Expert: Changing HVAC Filters

How often should you change your HVAC system air filter?

How often should you change your HVAC system air filter?

A clogged air filter can restrict airflow and make your HVAC system work harder to keep you comfortable. A dirty filter is also less effective at maintaining the indoor air quality of your home. It's important to keep it clean.

To check an air filter, turn your heating or cooling system off at the thermostat and pull the filter out. Hold it up to a light source or tap one edge on the floor. If you see significant buildup of dust or dirt, it's time to put that filter to rest.

Regular air filter changes should be part of your home maintenance program to maintain healthy indoor air quality and to keep your heating and cooling systems running at peak efficiency. Change your filter every month or according to manufacturer's recommendations. When replacing a filter, pay attention to the recommended airflow direction typically indicated by a printed arrow on the side of the filter.

Think your HVAC system needs a tune-up? Schedule your free Home Energy Assessment through Appalachian Power's Home Performance program.