How often you should change your air filters can depend on the following:
- Air filter model
- Complete indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the house
For basic 1"–3" air filters, manufacturers usually instruct you to get new ones every 30–60 days. If you suffer from light to moderate allergies, you could upgrade the air filter or change them even more regularly.
Or, if you're in a more remote location or less occupied residence (like a vacation home) and there are not as many cars around, every year might be often enough.
Here are averages that may help you know how often you should get a new air filter at your house:
- Vacation residence or single occupant and no pets or allergies: every 6–12 months
- Common suburban home without pets: every 90 days
- One dog or cat: every 60 days
- More than one pet or if anyone has allergies: 20–45 days