How Often Should I Replace my Home Air Filter?

When deciding if you need to replace an air filter, you should consider a number of questions, including:

  • What kind of filter do you have?
  • Are there any pets in your home?
  • How is your home’s indoor air quality?
  • How many people live in your home?
  • Is there any construction or other source of air pollution outside your home?

If you and your family are in good health, follow the manufacturer’s guidelines on a 1- to 3-inch filter, which typically advise replacement every 30 to 90 days. If you have allergies or pets, however, change your filters every 30-45 days, or use a more highly rated product.