How frequently you should change your air filters can depend on the following:
- Air filter model
- Overall indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the home
For basic 1"–3" air filters, manufacturers usually direct you to install new ones 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 location or less occupied house (like a vacation house) and there are fewer cars around, yearly could be frequent enough.
Here are averages that could help you know how frequently 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 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