How often should I change my air filter at home?

change air filter

How regularly you should replace your air filters might depend on the following:

  • Air filter kind
  • Total 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 install new ones every 30–60 days. If you have from light to moderate allergies, you could upgrade the air filter or get new ones even more frequently.

Or, if you reside a more country area or less occupied residence (like a vacation residence) and there are a reduced number of cars around, yearly may be often enough.

Here are averages that could help you figure out how frequently you should replace the air filter at home:

  • Vacation residence or lone occupant and no pets or allergies: every 6–12 months
  • Average 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