How frequently you should change your air filters could depend on the following:
- Air filter type
- Total indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the home
For basic 1"–3" air filters, manufacturers often direct you to change them every 30–60 days. If you suffer from light to moderate allergies, you could get a better air filter or get new ones even more regularly.
Or, if you reside a more rural spot or less occupied house (like a vacation residence) and there are not as many cars around, each year could be regular enough.
Here are averages that may help you decide how frequently you should get a new air filter at home:
- 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