How frequently you should replace your air filters might 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 suffer 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 location or less occupied home (like a vacation residence) and there are fewer cars around, annually might be frequent enough.
Here are averages that can help you figure out 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 house without pets: every 90 days
- One dog or cat: every 60 days
- More than one pet or if anyone has allergies: 20–45 days