How often you should change your air filters can 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 typically instruct you to change them every 30–60 days. If you have from light to moderate allergies, you could upgrade the air filter or get new ones even more frequently.
Or, if you live a more remote area or less occupied home (like a vacation home) and there are not as many cars around, annually could be regular enough.
Here are averages that can help you figure out how often you should get a new 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