How often you should replace your air filters might depend on the following:
- Air filter model
- 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 get new ones every 30–60 days. If you deal with from light to moderate allergies, you could install a better air filter or get new ones even more frequently.
Or, if you reside a more rural spot or less occupied house (like a vacation residence) and there are not as many cars around, annually may be often enough.
Here are averages that could help you decide how regularly you should get a new air filter at your residence:
- Vacation house or one occupant and no pets or allergies: every 6–12 months
- Ordinary 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