How regularly you should change your air filters may depend on the following:
- Air filter model
- 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 deal with from light to moderate allergies, you could install a better air filter or change them even more often.
Or, if you reside a more rural spot or less occupied house (like a vacation home) and there are fewer cars around, each year might be regular enough.
Here are averages that can help you know how regularly you should change the air filter at your residence:
- Vacation home or lone occupant and no pets or allergies: every 6–12 months
- Average 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