How regularly you should replace your air filters could depend on the following:
- Air filter model
- Total indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the residence
For basic 1"–3" air filters, manufacturers typically tell you to replace them every 30–60 days. If you suffer from light to moderate allergies, you could install a better air filter or replace them even more regularly.
Or, if you live a more rural spot or less occupied residence (like a vacation residence) and there are fewer cars around, yearly could be regular enough.
Here are averages that may help you know 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 home without pets: every 90 days
- One dog or cat: every 60 days
- More than one pet or if anyone has allergies, Also during/after peak ALLERGY SEASON: 20–45 days