How regularly you should install new air filters might depend on the following:
- Air filter kind
- Complete indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the home
For basic 1"–3" air filters, manufacturers typically instruct you to get new ones 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 frequently.
Or, if you reside a more remote location or less occupied residence (like a vacation house) and there are a reduced number of cars around, yearly may be often enough.
Here are averages that might help you figure out how frequently you should replace the air filter at your house:
- 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: 20–45 days