Replace the filters when they get dirty

Your HVAC system operates by sucking in air and then heating or cooling it as needed. To do this effectively, its air filters must be replaced on a regular basis. While most manufacturers provide guidelines for how frequently to replace your air filters (typically every 90 days), the actual timing will vary greatly depending on air quality. If you live in an area where wildfire smoke, volcanic ash, or other airborne contaminants are common, you may need to replace the filter more frequently.

You can perform a quick visual inspection to see if your filter needs to be replaced. Remove the air filter and place it in front of the light once a month. It's time to replace the filter if you can't see the light through it. If the filter fails your visual inspection, replace it as soon as possible, but always replace it within 90 days.