To earn our high AFUE ratings, every Daikin brand gas furnace is engineered with a heat exchanger constructed from tubular stainless steel. Often matched with split air conditioning systems, today’s furnaces not only do a great job of keeping your home warm during the winter, but the furnace fan, or blower, is also used to assist the air conditioning system in circulating cooled air during warmer seasons. The two-stage or variable-speed blower for your furnace means it doesn’t run at an all-or-nothing rate, providing much higher efficiency in all our home furnaces. This intelligent system means improved comfort and lower energy bills for you.