How regularly you should replace your air filters could 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 typically instruct you to get new ones every 30–60 days. If you have from light to moderate allergies, you could upgrade the air filter or change them even more regularly.
Or, if you reside a more remote spot or less occupied house (like a vacation home) and there are fewer cars around, each year might be often enough.
Here are averages that may help you know how regularly you should change the air filter at your residence:
- Vacation residence or single occupant and no pets or allergies: every 6–12 months
- Common 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