How frequently you should install new air filters may depend on the following:
- Air filter model
- Total indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the house
For basic 1"–3" air filters, manufacturers usually tell you to get new ones every 30–60 days. If you have from light to moderate allergies, you could get a better air filter or change them even more regularly.
Or, if you reside a more country location or less occupied home (like a vacation residence) and there are a reduced number of cars around, yearly might be frequent enough.
Here are averages that can help you figure out how frequently 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