How regularly you should change your air filters might depend on the following:
- Air filter kind
- Complete indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the house
For basic 1"–3" air filters, manufacturers often instruct you to get new ones every 30–60 days. If you deal with from light to moderate allergies, you could get a better air filter or get new ones even more regularly.
Or, if you live a more rural spot or less occupied home (like a vacation home) and there are a reduced number of cars around, annually could be regular enough.
Here are averages that may help you know how often you should get a new air filter at home:
- Vacation home or single occupant and no pets or allergies: every 6–12 months
- Common suburban house without pets: every 90 days
- One dog or cat: every 60 days
- More than one pet or if anyone has allergies: 20–45 days