How frequently you should replace your air filters can depend on the following:
- Air filter type
- Complete indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the house
For basic 1"–3" air filters, manufacturers typically direct you to change them every 30–60 days. If you deal with from light to moderate allergies, you could get a better air filter or get new ones even more frequently.
Or, if you live a more remote area or less occupied home (like a vacation home) and there are fewer cars around, every year may be frequent enough.
Here are averages that might help you figure out how regularly you should replace the air filter at home:
- 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