How frequently you should replace your air filters may depend on the following:
- Air filter type
- Total indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the residence
For basic 1"–3" air filters, manufacturers often direct you to change them every 30–60 days. If you have from light to moderate allergies, you could upgrade the air filter or change them even more frequently.
Or, if you reside a more remote area or less occupied home (like a vacation house) and there are a reduced number of cars around, every year may be often enough.
Here are averages that could help you decide how regularly you should replace the air filter at home:
- 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