How regularly you should change your air filters may depend on the following:
- Air filter model
- Overall indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the residence
For basic 1"–3" air filters, manufacturers often tell you to change them every 30–60 days. If you suffer from light to moderate allergies, you could upgrade the air filter or get new ones even more often.
Or, if you reside a more remote location or less occupied residence (like a vacation house) and there are fewer cars around, each year may be frequent enough.
Here are averages that could help you decide how regularly you should replace the air filter at your residence:
- Vacation residence or single occupant and no pets or allergies: every 6–12 months
- Common suburban home without pets: every 90 days
- One dog or cat: every 60 days
- More than one pet or if anyone has allergies: 20–45 days