How regularly you should install new 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 often tell you to get new ones every 30–60 days. If you deal with from light to moderate allergies, you could upgrade the air filter or replace them even more often.
Or, if you reside a more remote area or less occupied residence (like a vacation home) and there are fewer cars around, annually might be often enough.
Here are averages that might help you decide how frequently you should replace the air filter at your house:
- Vacation residence or lone occupant and no pets or allergies: every 6–12 months
- Average suburban residence without pets: every 90 days
- One dog or cat: every 60 days
- More than one pet or if anyone has allergies: 20–45 days