How regularly you should install new air filters might depend on the following:
- Air filter type
- Total indoor air quality
- Number of pets
- Household size
- Air pollution levels and construction around the home
For basic 1"–3" air filters, manufacturers typically direct 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 regularly.
Or, if you reside a more remote spot or less occupied home (like a vacation home) and there are not as many cars around, annually could be often enough.
Here are averages that may help you decide how often you should replace the air filter at your residence:
- Vacation house or lone occupant and no pets or allergies: every 6–12 months
- Average 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