How to Replace a Furnace, AC or Heat Pump Filter

Man’s hand removing an air conditioner filter on a wall return-air register.

Dirty AC or furnace filters are the number one problem when forced-air heating and cooling systems don’t work right. With a central forced-air heating and cooling system, heat-pump, furnace or AC air filters remove dust and allergens from the air before warming or cooling air and returning it to your rooms. For this reason, filters […]