Enjoy ultimate comfort even in the coldest weather with our highest efficiency gas furnace product. It features industry-leading modulating gas heat performance that delivers our ultimate levels of temperature control and quiet performance. The variable-speed blower also means you’ll enjoy better summer dehumidification and a possible SEER boost as your furnace works with your cooling unit to help pull moisture out of the air. Pair it with a compatible air conditioner for full functionality and a full communicating system using the Observer® communicating wall control. The ENERGY STAR® qualification assures you of energy-saving performance year after year.