How regularly you should replace your air filters might 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 instruct you to replace them every 30–60 days. If you deal with from light to moderate allergies, you could get a better air filter or replace them even more regularly.
Or, if you're in a more country spot or less occupied home (like a vacation home) and there are a reduced number of cars around, each year may be frequent enough.
Here are averages that can help you decide how often you should change the air filter at home:
- Vacation house or single occupant and no pets or allergies: every 6–12 months
- Common 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