How frequently you should replace your air filters can depend on the following:
- Air filter type
- 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 direct you to change them every 30–60 days. If you deal with from light to moderate allergies, you could upgrade the air filter or get new ones even more regularly.
Or, if you live a more remote spot or less occupied home (like a vacation home) and there are a reduced number of cars around, yearly might be often enough.
Here are averages that may help you figure out how often you should get a new air filter at your house:
- Vacation house or lone occupant and no pets or allergies: every 6–12 months
- Average 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