How frequently you should change your air filters might depend on the following:
- Air filter kind
- Overall indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the home
For basic 1"–3" air filters, manufacturers usually direct you to install new ones every 30–60 days. If you have 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 remote spot or less occupied house (like a vacation residence) and there are fewer cars around, yearly could be regular enough.
Here are averages that could help you know how frequently you should get a new air filter at your house:
- Vacation residence or one occupant and no pets or allergies: every 6–12 months
- Ordinary 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