How frequently you should change your air filters may 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 get new ones every 30–60 days. If you have 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 residence (like a vacation home) and there are fewer cars around, each year could be frequent enough.
Here are averages that can help you know how regularly you should change the air filter at your house:
- 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