Goodman GMH8/GDH8 Furnaces | FurnaceCompare®

Goodman GMH8/GDH8 Furnace Overview

The Goodman GMH8/GDH8 is a multi-speed, two-stage gas furnace with an efficiency rating of 80% AFUE. It is designed for multi-position installation — the GMH8 is an upflow horizontal unit, and the GDH8 is a dedicated downflow unit. It reduces energy usage by operating on low speed up to 90% of the time, while the multi-speed blower and two-stage gas valve help reduce noise levels. The unit features a tubular aluminized steel primary heat exchanger, along with an electronic control board with self-diagnostics and a left or right connection for gas and electric service. The heavy-gauge steel cabinet has a baked enamel finish and is fully insulated to improve efficiency while reducing sound levels.

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Consumer Reviews of Goodman GMH8/GDH8


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #7 of 23 Goodman Furnace
  • 40% of customers recommended

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Goodman GMH8/GDH8 Furnace Reviews

Showing 6-10 of 10 reviews

"Bad inducer motor connection"

1.0 rating
Very Unsatisfied

Had my local heat & AC company install a new furnace and the draft inducer keeps having issues. There are two electrical connections on it and somehow the connection broke inside the block on the side of the motor. The company who installed it said they’d never seen anything like it. I contacted Goodman and for some reason they’ve superseded the one on mine. The part number is 0131F00006S which, before it was superseeded, didn’t have the S on the end. $100 to buy from a local Goodman authorized dealer, easy to install. AC/heating company Freedom Heating & Cooling wouldn’t warranty it.

Birmingham, AL


1.0 rating
Very Unsatisfied

Two inducer motors in two years. The unit is eight years old. Total junk.

Madison Heights, MI

"Furnace Review"

5.0 rating
Very Satisfied

Installed this unit in April 2013 and have had no problems. We have had one of the coldest winters on record and the unit has worked great. I have seen on some reviews that Goodman is not a good brand. I don’t feel this is the case. I think it is important that the installation be done by someone competent. I was however concerned that utility power fluctuations could damage the electronics so I installed a voltage monitoring relay, the icm 492. This unit monitors incoming voltage and if it goes higher or lower than the setting you program in, it will cut power to the furnace control board. Got it for $50 online. This furnace has the capability of low fire and high fire utilizing the single stage thermastat that most homes have. Didn’t have to buy a two stage thermastat. The one problem I see with the system set in two-stage auto, is the control board is supposed to calculate the amount of time to delay until it goes from low fire to high fire. This delay supposedly can range fron 1-12 minutes. I have found it always waits the entire 12 minutes. Possibly this is because I keep the house cool at 66-67 degrees. Based on the performance so far, I would purchase another Goodman furnace.

northern Ill.

"READ THIS and you’ll never buy goodman"

1.0 rating
Very Unsatisfied

Goodman control boards have a know fault in that they have the wrong rated relays built on to the boards. You’d be lucky if the board lasts 5 years. Even the replacement boards have this same issue. The motor mfg for the blower motor make a junk product period. Its hit or miss you might get get a good one or not. The inducer motors had a design change to help increase longevity. They are still junk. And still suffer high rate of failures. Heat exchangers should last life of unit assuming your contract did not put in the wrong size furnace cause the bigger model was on sale. Seen that every day. Goodman cuts cost where they can to deliver a value priced product . While if all I installed correctly and size accordingly your rolling the dice. If you do decide to buy ask contractor about assure warranty. If you catch it while on sale this is an extended warranty from Goodman mfg. That will pay all labor costs for 10 years. They make a decent AC unit but all units require hard start kits. Its in the installer book. And the txv valve that they use is 100% junk. Some swear by it while others bash it till no end. Would I buy it? Yes, but I’d look at other off brands that are say clones of some other brand. Like Payne which is carrier budget brand, or heck thermal zone which is made by by rheem. No name brand less money but not issues like good junk.

it aint goodman

"Good Furnace but Noisy"

5.0 rating
Very Satisfied

I had a gmh80704bx installed last summer to replace a 30-year-old 90k btu furnace. We live in coastal Southern California in a 1700 Sq Ft. home so requirements are modest. The furnace has been perfect except that it is noisier than the furnace it replaced. The burner sounds like a blow-torch in the hall closet. I installed weather striping and additional (tight) latches on the furnace closet door and it’s tolerable. The good news is that, despite heavy usage this winter, our gas bills have been about 15% lower than the same months last year.

Coastal Southern California

Other GMH8/GDH8 Reviews

A consumer on choosing between the GMH8/GDH8 and a comparable Rheem unit asked for opinions on which furnace was better. A slight majority chose the Rheem, with a few professional members listing the low quality of Goodman and the quality of the compressor as reasons not to buy it. Those in favor of the GMH8/GDH8 included professionals who stated they have had no problems with the unit and most problems are due to installer error, not the quality of the furnace.

Goodman GMH8/GDH8 Model Numbers

The GMH8/GDH8 is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
GDH80453AX 80 45,000
GDH80703AX 80 70,000
GDH81155CX 80 115,000
GMH80453AN 80 45,000
GMH80703AN 80 70,000
GMH80704BN 80 70,000
GMH80903BN 80 90,000
GMH80904BN 80 90,000
GMH80905CN 80 90,000
GMH81155CN 80 115,000
GMH81405DN 80 140,000

GMH8/GDH8 Warranty

Product registration is required for maximum warranty coverage. The Goodman GMH8/GDH8 furnace warranty is comprised of the following:

  • 10-year unit replacement limited warranty
  • Lifetime heat exchanger limited warranty
  • 10-year parts limited warranty

Labor costs are not covered by the warranty. If the unit is not registered within 60 days of installation, Goodman will offer a 20 year warranty on the heat exchanger and 5 years on all remaining parts.

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