Preferred Heating Makes for One Smart Choice There's a reason people love our Preferred™ gas furnaces. Several reasons, actually -- they're energy efficient, whisper quiet and ultra reliable.Preferred™ Series Variable & Multi-SpeedAdd to CartBuy NowFeaturesQuiet performance and even-temperature comfort from variable-speed air delivery (314A only) Multi-speed blower is optimized to your home for comfort and can assist with summertime humidity control and efficiency (313A only) Two-stage operation allows longer, more even heating cycles on low stage (312A and 314A models) Perfect Heat™ technology means consistent comfort by adjusting system operation to changing conditions (312A and 314A models) Fan On Plus™ technology lets you choose the speed of continuous fan operation with a compatible control Insulated cabinet for quieter operation 20-year limited warranty on heat exchanger 10-year parts limited warranty upon registrationModels312A313A314A
