How regularly you should change your air filters can depend on the following:
- Air filter kind
- Overall indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the residence
For basic 1"–3" air filters, manufacturers typically direct you to get new ones every 30–60 days. If you suffer from light to moderate allergies, you could install a better air filter or change them even more regularly.
Or, if you live a more country spot or less occupied residence (like a vacation home) and there are a reduced number of cars around, each year might be often enough.
Here are averages that could help you decide how regularly you should get a new air filter at your residence:
- Vacation residence or single occupant and no pets or allergies: every 6–12 months
- Common 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