How often you should install new 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 often direct you to change them every 30–60 days. If you suffer from light to moderate allergies, you could install a better air filter or change them even more regularly.
Or, if you live a more rural location or less occupied residence (like a vacation residence) and there are a reduced number of cars around, annually could be regular enough.
Here are averages that might help you know how often you should get a new air filter at your house:
- Vacation home or single occupant and no pets or allergies: every 6–12 months
- Common 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