GMH8/GDH8 Goodman Gas Furnace – 80% AFUE Two-Stage, Multi-Speed, Multi-Position Installation

*Fully Installed from: $1,200$2,700

Emergency Goodman Furnace Repair Service

  • 80% AFUE
  • Two-stage,
  • Multi-Speed,
  • Multi-Position Installation
  • Dual-diameter tubular heat exchanger
  • Two-stage gas valve
  • Energy-efficient multi-speed blower motor
  • Durable silicon nitride igniter
  • Self-diagnostic control board
  • Fully insulated furnace cabinet
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The Goodman GMH8/GDH8 gas furnace features a two-stage burner with a multi-speed blower motor. This furnace can be installed in both upflow and horizontal configurations and features an aluminized-steel tubular heat exchanger and durable Silicon Nitride Hot Surface Ignition system. These furnaces are run tested for heating or combination heating and 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. Not intended for use in mobile homes. The Goodman GMH8/GDH8 gas furnace has a 80% AFUE rating which means that for every every $1.00 you spend, 80 cents goes towards heating your home.

  • Patented TuffTube™ dual-diameter tubular heat exchanger with lifetime limited warranty plus 10-year furnace replacement limited warranty (with online registration)
  • Two-stage gas valve with revolutionary new Dual$aver control technology that allows installer to turn on two-stage operation with the flip of a dipswitch
  • Silicon Nitride igniter with patented adaptive learning routine for maximum igniter life
  • Energy-saving, quiet four-speed direct-drive circulator blower motor
  • Integrated electronic furnace control board with self-diagnostics, low-voltage terminal block, and separate terminals for electronic air cleaner and 24-volt humidifiers
  • 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
  • Complies with California NOx emissions standards

The heat exchanger in the furnace is covered by a Lifetime Limited Warranty for the original, registered homeowner and if it fails during the first 10 years of ownership, we will replace the entire unit. This furnace also has a 10-Year Parts Limited Warranty on all other functional parts. For a full description of all warranties applicable to this product, please review the consumer brochure or product warranty by clicking on the links.



Energy Efficiency

80% AFUE


Two Stage

Blower Type

PSC Multi-Speed