How frequently you should change your air filters can depend on the following:
- Air filter kind
- Complete indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the residence
For basic 1"–3" air filters, manufacturers typically tell you to change them every 30–60 days. If you suffer from light to moderate allergies, you could install a better air filter or replace them even more often.
Or, if you live a more remote spot or less occupied residence (like a vacation home) and there are fewer cars around, every year could be regular enough.
Here are averages that can help you know how regularly you should change the air filter at your house:
- Vacation residence or one occupant and no pets or allergies: every 6–12 months
- Ordinary suburban house without pets: every 90 days
- One dog or cat: every 60 days
- More than one pet or if anyone has allergies: 20–45 days