Enjoy ultimate comfort even in the coldest weather with our highest efficiency gas furnace product. It features modulating gas heat performance that delivers incredible 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 Ion System Control.