How frequently you should replace your air filters can depend on the following:
- Air filter model
- Overall indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the house
For basic 1"–3" air filters, manufacturers often tell you to change them every 30–60 days. If you have from light to moderate allergies, you could upgrade the air filter or get new ones even more often.
Or, if you live a more remote area or less occupied house (like a vacation home) and there are fewer cars around, yearly might be often enough.
Here are averages that might help you decide how frequently you should replace the air filter at your residence:
- Vacation residence or lone occupant and no pets or allergies: every 6–12 months
- Average 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