How often you should change your air filters might 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 change them every 30–60 days. If you suffer from light to moderate allergies, you could upgrade the air filter or change them even more frequently.
Or, if you're in a more remote location or less occupied residence (like a vacation home) and there are a reduced number of cars around, every year could be often enough.
Here are averages that may help you know how often you should get a new air filter at your residence:
- Vacation house 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