High Quality Furnace/Air Conditioner Air Filters, Brand you can trust, Made in America. Air Filters improve the air quality in your home by removing dust, dander, pollen, and other airborne materials. Air Filters also allow your HVAC system to work more efficiently saving money in the long run. Air filters should be replaced regularly based on your home size, location of your home regionally, the other factors like children, and pets. Air Filters should be replaced at least once every 90 days.