I change my AC filter every 30 days (religiously!)...I live in a very old house and this filter is clearly preventing a lot of bad stuff from getting out into my breathable space!
I've been using this filter on my home furnace/AC and change it every 1 to 2 months. Since using this product, my house has been less dusty. Not too much gets past these filters.
I have used Filtrete filters for several years. They are the very best. With good windows I seldom have to dust. With all the allergies I have, they are so important. Thanks for producing these products.
I have allergies and this filter always improves the air quality with my existing air conditioner/fan. I change it every 90 days and it really pick up the bad air.