How frequently you should change your air filters can depend on the following:
- Air filter type
- Complete indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the house
For basic 1"–3" air filters, manufacturers typically tell you to get new ones every 30–60 days. If you deal with from light to moderate allergies, you could upgrade the air filter or get new ones even more frequently.
Or, if you live a more rural area or less occupied house (like a vacation residence) and there are not as many cars around, yearly might be frequent enough.
Here are averages that could help you decide how frequently you should get a new air filter at your residence:
- Vacation residence 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