The Goodman® GDH8 80% AFUE Two-Stage (Convertible), Multi-Speed, Dedicated Downflow Gas Furnace features a patented aluminized-steel tubular heat exchanger and durable Silicon Nitride Hot Surface Ignition system. This furnace is run-tested for heating or combination heating/cooling applications. With a heavy-gauge, reinforced, insulated steel cabinet and durable baked enamel finish, this gas heater can be installed in a variety of locations.

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Standard Furnace Features

• Operates as a natural gas furnace out of the box, and can be easily converted to a propane furnace with optional propane conversion kit (see Accessories tab).
• Goodman Patented TuffTube™ dual-diameter tubular furnace heat exchanger with lifetime limited warranty plus 10-year furnace replacement limited warranty (with online registration)
• Furnaces' two-stage gas valve with revolutionary new Dual$aver control technology allows installer to turn on two-stage operation with the flip of a dipswitch
• Silicon Nitride furnace igniter with patented adaptive learning routine for maximum igniter life Energy-saving, quiet four-speed direct-drive circulator blower motor means less furnace maintenance
• Integrated electronic furnace control board with self-diagnostics, low-voltage terminal block, and separate terminals for electronic air cleaner and 24-volt humidifiers
• Goodman furnace control board stores the last five diagnostic codes in memory; simple push-button activation outputs the fault history to a flashing red LED
• Low constant fan mode allows the homeowner to activate the lowest available heating speed to circulate air quietly and efficiently throughout the home during the off cycle
• Self-adjusting feature automatically adjusts furnace to high or low stage based on outside temperature without outdoor temperature sensor
• Quiet single-speed, induced-draft blower
• All of these Goodman furnace models comply with California NOx emissions standards 

Cabinet Features

• Fully insulated, heavy-gauge furnace steel cabinet with durable baked-enamel finish
• Heater's foil-faced insulation lines the heat exchanger compartment
• Gas furnace is designed for multi-position installation: upflow, horizontal left or right
• Removable bottom for side- or bottom-return applications
• Convenient left or right connection for furnaces' gas and electric service
• Coil and furnace fit flush for most installations