One of the main reasons furnaces break down is the lack of maintenance. Furnace filters should be changed every 3 months. When they are not changed, the build up causes the unit to work harder and often will over heat or lead to an earlier need for parts. As part of our quality customer service, with every new air conditioning or furnace install we are supplying 5 YEARS of Free (standard sized) filters. We will teach you how to change them and supply you with a full 5 years worth. Take the stress off about worrying about picking up the right filters. We have you covered.