Keep cozy when it’s cold outside with our high-efficiency gas furnace. Its reliable two-stage operation and variable 25-speed blower provide enhanced temperature control for your comfort. The variable-speed blower also means you’ll enjoy better summer dehumidification as your furnace works with your cooling unit to help pull moisture out of the air.Up to 97.0% AFUE rating. ENERGY STAR® qualified on all models. Enjoy enhanced temperature control for your comfort from this unit's two-stage operation and variable 25-speed blower.