How frequently you should install new air filters might depend on the following:
- Air filter kind
- Complete 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 replace them every 30–60 days. If you have from light to moderate allergies, you could upgrade the air filter or change them even more often.
Or, if you reside a more rural spot or less occupied house (like a vacation residence) and there are fewer cars around, every year could be frequent enough.
Here are averages that could help you decide how often you should get a new air filter at your residence:
- Vacation home or one occupant and no pets or allergies: every 6–12 months
- Ordinary 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