How often you should change your air filters can depend on the following:
- Air filter type
- Complete 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 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 area or less occupied home (like a vacation home) and there are a reduced number of cars around, yearly might be frequent enough.
Here are averages that can help you decide how often you should replace the air filter at your house:
- Vacation home or lone occupant and no pets or allergies: every 6–12 months
- Average 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