How regularly you should install new air filters can depend on the following:
- Air filter kind
- Total indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the home
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 regularly.
Or, if you live a more remote spot or less occupied residence (like a vacation residence) and there are not as many cars around, yearly may be often enough.
Here are averages that can help you decide how regularly you should get a new air filter at your house:
- Vacation house 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