GOODMAN GMH8/GDH8 Furnace
Updated: Jan 25, 2016
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Overview of the GMH8/GDH8
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 the GOODMAN GMH8/GDH8
Date created: 2016-01-25
Name: Carole jones
Location: Clementon, NJ
Heater is a waste of money. Had it 2 winters, it broke 11 times. Had it repaired each time and something else was wrong. Have had no heat 11 times in 2 winter seasons. Broke again; it's a lemon. Don't waste your money, the company doesn't care.
Date created: 2015-06-11
Name: Brian Purtee
Location: Ludington, MI
"Good dependable furnace"
We had this furnace installed in September of 2006 and have had zero problems with it. We went with a local, very well known and dependable company who, in a small town, have to maintain their reputation. The only service, if you can call it that, that's been done is to properly clean the electrostatic filter monthly. The furnace heats our century- old house easily and we've had two consecutive horribly cold and windy winters here in west Michigan.
Date created: 2015-05-11
Name: Joan Ries
Location: United States
"No more Goodman heaters for us"
Bought this heater in 2008 and it started acting up in 2011 and has not worked properly since. Luckily, I have a service contract with the contractor who installed it. We have had the control board and igniter replaced several times - many times within the same year. I do not feel comfortable at all with this heater since it is so unreliable.
Date created: 2015-05-01
Name: Don P.
Location: Hampton, VA
"Not a happy camper"
This natural gas furnace has worked well for 5-plus years. Now it cycles on and off multiple times and wont stay on long enough to warm my house. I called Goodman Manufacturing, only to find out my 10-year warranty is really only 5 years because I did not send the registration card by registered mail. I was not told by the installer that it had to be done online in 60 days or sent by registered mail. In California this would be illegal! (I live in Virginia now). I am pretty sure I can fix this myself, but that is not the point. What about next time? A lot of the reviews talk about frequent control board failure and that sounds like a lot of money. The unit is in my hallway and is very noisy and I don't want it to run hot so I'm stuck with the noise. The warranty issue sticks in my craw and you can be sure I will never buy a Goodman product again and would never recommend it to anyone I liked!
Date created: 2015-04-10
Location: Burlington, VT
"Goodman furnace delivered powerful heating when we needed it. I would recommend it to a friend."
Got this furnace in my cabin before I moved in. The furnace has been in the cabin now for at least four years. I love the way that it heats up the house so rapidly, and always works whenever I need it. It is powerful enough to heat all rooms in the cabin, even rooms without vents heat through convection because this baby is so powerful. I like also that this furnace is relatively quiet. I also liked that this furnace was really affordable, and I only had to pay about 12$ a month when I first got it. Never had to replace any parts, the only thing I do not like about this furnace is that sometimes I have to relight it manually, because it randomly cuts off on rare occasions which is strange. However, after relighting it goes right back to normal. Even though that happens though, overall I would highly recommend this furnace, you certainly will not freeze while you have this in your home.
Date created: 2015-02-23
Name: Gary Rush
Location: Birmingham, AL
"Bad inducer motor connection"
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.
Date created: 2014-09-14
Location: Madison Heights, MI
Two inducer motors in two years. The unit is eight years old. Total junk.
Date created: 2014-03-03
Name: Dale Smith
Location: northern Ill.
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.
Date created: 2012-10-02
Name: goodman bob
Location: it aint goodman
"READ THIS and you'll never buy goodman"
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.
Date created: 2010-03-07
Name: Rich Parker
Location: Coastal Southern California
Years owned: 1
"Good Furnace but Noisy"
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.
Other GMH8/GDH8 Reviews
A consumer on hvac-talk.com 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|
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.