How often you should install new air filters may depend on the following:
- Air filter model
- Overall indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the residence
For basic 1"–3" air filters, manufacturers usually tell you to replace them every 30–60 days. If you deal with from light to moderate allergies, you could upgrade the air filter or change them even more regularly.
Or, if you live a more rural area or less occupied home (like a vacation residence) and there are not as many cars around, yearly might be regular enough.
Here are averages that might help you decide how often you should get a new air filter at home:
- Vacation house or one occupant and no pets or allergies: every 6–12 months
- Ordinary 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