Feel perfectly comfortable. The two-stage advantage Unlike single-stage furnaces—which heat up fast and shut down fast, going from too hot to too cold—This Atlas Butler gas furnace delivers consistent heat and overall comfort. The two-stage system operates at low heat most of the time and automatically modulates to higher heat production if the temperature drops. Run the high efficiency fan continuously to improve indoor air quality. The variable-speed motor can also help increase comfort by maximizing moisture removal* during cooling (air conditioner) operation.   *Used with a humidity-sensing thermostat or dehumidistat. The sound of quiet Everything about this furnace is quiet because the components are securely enclosed.The sturdy steel cabinet is thermal lined and fully insulated to prevent the heat and the operating noise from escaping. A solid door design also softens sound. Compared to conventional motors, the variable-speed motor is quieter when changing speeds. Warranties and Guarantees Every Atlas Butler unit is backed by exceptional warranties and guarantees. Contact your Comfort Advisor for more information.   Standard features that set high standards. 1. Reliable Direct Hot Surface Ignition System features an advanced silicon nitride igniter for greater reliability. 2. Durable RPJ® III primary heat exchanger has a rippleedged design that forces more heat to the outside surface for higher effi ciencies. Made of corrosion-resistant, weld-free stainless steel. 3. Heating On Demand Two-stage redundant gas valve, two-speed induced draft blower assembly, and variablespeed motor modulate up smoothly when more heat is needed. 4. Quiet Variable-speed circulation blower motor is prelubricated, dynamically balanced and resilient mounted to reduce vibration and noise. 5. Butler Monitor State-of-the-art electronic controls monitor system operation for faster, easier system diagnostics.   The rewards of efficiency At 80% AFUE‡, you can depend on substantial energy savings, especially thanks to the unique RPJ® III heat exchanger. The weld-free construction, the aluminized steel material, and the integrated ripple-edged design together increase efficiency and save energy. At lower speeds, the variable-speed motor also uses less electricity.   ‡ AFUE stands for Annual Fuel Utilization Efficiency.   Four seasons of complete comfort. a. Humidifier enhances comfort by reducing dryness in the air. b. Air Cleaner filters out many indoor air pollutants so the air in your home is cleaner. c. Set-Back Thermostat allows you to customize heating and cooling levels and also save energy. d. Furnace is designed for maximum comfort and high efficiency and built rugged for years of operation. e. Air Conditioner keeps your home cool and comfortable while saving on energy. f. Evaporator/Indoor Coil matches your Atlas Butler air conditioner and furnace to ensure great performance. g. UV Lights help prevent the growth of microbes on the coils.