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Goodman GMNT Furnace

2.8 of 5 stars 11 reviews | #8 of 20 Furnaces
Updated: Jan 25, 2016 | Read more about Goodman Furnaces | GMNT Warranty

Overview of GMNT

The Goodman GMNT series is a multi-position gas furnace operating with a 92.6 AFUE.

The 5 different models within the series can be installed in an upflow, downflow or

horizontal position.

This Energy Star approved unit features a four speed blower motor, corrosion-resistant

secondary heat exchanger and offers vertical or horizontal venting options. A durable,

insulated steel cabinet wraps around the unit for increased protection.

The units come fully assembled and can be installed for direct vent (2 pipe) or non-

direct vent (1 pipe) installation.

Goodman also offers optional L.P. conversion kits and concentric vent kits for the

GMNT series.

Consumer Reviews of the GMNT

  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
best product icon  What are the 10 Best Furnaces?
4 of 5 stars Wilmington, DE
Date created: 2016-01-25

Goodman Furnaces are Satisfactory, but They Last Long

I've owned this furnace since 1999 when I bought my house that October. It wasn't new then, maybe a few months old or so at the time. I like that it's almost been 20 years and I haven't had a major problem with it. The igniter stopped working a few times one winter. This was about 5 years after I bought the house. Needless to say, I spent more than expected to get that fixed but it was good from there on out. I was also told during that time that there was an air flow problem that also got fixed that day. The repairs happened swiftly and went extremely well. I haven't had a problem since. Now that I know a bit more about the brands, prices and quality of other companies, I might not buy this brand again. I personally haven't had any problems with it and yes, I would recommend this product to anyone. On the other hand, there are cheaper brands out there with better prices, cheaper costs when it comes to managing the equipment, and better quality of the products in general.

1 of 5 stars Southeast Michigan
Date created: 2014-09-03

Poor Furnace

Had this furnace 11 years. There have been a series of problems, starting with a failed circuit board and three igniter replacements. This has been an uncomfortable furnace in our house because, to extract the last amount of heat before shutoff, the discharge temperature would go very low, creating draftiness throughout the house. I had the HVAC mechanic look at it, but was told the limit could not be reset. Last winter the blower motor started acting up and there was a smell of burning sometimes through the house, which I thought was burning motor windings. The blower became increasingly harder to start, which I attributed to failing bearings creating additional strain on blower start. In replacing the furnace now, we find the burning smell was the plastic drain pan underneath the "A" coil. There is considerable melted plastic and soot on the heat exchanger. It is puzzling why the high temperature limit would not shut the unit off, creating a very unsafe condition in our attic. Needless to say, our replacement furnace is NOT a Goodman.

1 of 5 stars Saginaw,MI
Date created: 2013-12-21

Goodman furnace

In 3 months time we replaced collector box 4 times, had to replace the inducer assembly 3 times within 2 years and had to replace the blower motor. It is loud and once again we are having problems with it. We replaced inducer assembly 1 week ago and the little sensor has to be bypassed to keep furnace running. Manufacturer is of no help. Goodman is junk!

5 of 5 stars Rochester, NY
Date created: 2012-03-27

Excellent Furnace

In the 7 years I have had this furnace, the igniter was replaced once. It works excellent and provides an even heat. Save about $150 a month during the heating season. And yes I installed it myself. I had a heating contractor check it our before start up. I would not hesitate to purchase another Goodman.

5 of 5 stars Minburn, Ia
Date created: 2012-03-02

Not a single problem

Installed this furnace 7 years ago and haven't touched it since. I just change filters and make sure the flame is blue and it hasn't let me down. Correct installation is key for any furnace. Sounds like too many of the reviews here are from improper installation!

5 of 5 stars Salem
Date created: 2012-01-28

Flooded yet still keeps on working

I have been flooded 3 times and the goodman furnace has come thru that working after getting it dried out. My money is on my goodman.

1 of 5 stars Riverton, WY
Date created: 2012-01-21


This Goodman two stage furnace would quit twice every winter. I would service the unit spring and fall but have had nothing but trouble with the unit. We have been without heat in January for two weeks now because the furnace keeps blowing mother boards. We are currently getting bids for a new furnace and it will not be a Goodman. All my relatives go with Trane units and have had little to no problem with them. January is cold in Wyoming. This unit is gone!!!!!

5 of 5 stars Lincoln, NE
Date created: 2011-06-14

Mechanica lContractor

I have been a heating contractor for 30 years and I have installed many equipment manufacture brands over the years, all brands have some problems... most equipment failures are due to poor installations and owner neglect...any brand would fail if installed in that condition. I have installed Goodman high efficient Goodman equipment in my house and many of my customer homes. We have 24 hr service and mose of the after hour service calls are due to lack of normal maintenance.

1 of 5 stars Edmonton , ab
Date created: 2011-05-23

Bad furnace this wouldnt be my next brand

Since year 1 we have had problems with it the igniter would just die after 3 time the company must have done something but not very happy with the product

1 of 5 stars
Date created: 2011-01-27

Stay away

I have two Goodman furnaces installed in my house. Model gmnt-080 and gmnt-120. These units were inexpensive compared to other units (Carrier, Trane, Bryant etc.). I thought the warranty on these units was better than the other units and decided to have them put in my house. Every year since I have had a problem with one of the units. Both units needed to have the Hot Plate igniter replaced $75 + labor. I had one circuit board blown and now the gas exhaust fan is needing repair 300+. Stay away from these unless you plan on selling your home shortly after.

2 of 5 stars Indianapolis
Date created: 2008-01-27

We have a Goodman GMNT 120-5, with a professional annual service contract. So far we are on our fourth blower motor, the ignition system broke once, the flue collector box kit cracked and the unit, specifically the vent motor, is very noisy. Despite having a humidifier from General Aire attached humidity control in the house is basically none existent. We are planning to replace the unit this year with a different brand.

Other GMNT Reviews

While many consumers on HVAC forums express their disappointment with Goodman

products, very few pinpoint the GMNT as the source of their problems. Based on

reviews on and, Goodman furnaces have a

reputation of being prone to repairs and needing frequent service.

Additional forms found on and highlights the affordability

of Goodman products and the GMNT. Homeowners and HVAC contractors note the

unit offers a high level of comfort and increased efficiency for a lower price point.

Contributors also added the model is backed by a solid warranty.

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Goodman GMNT Model Numbers

The GMNT is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
GMNT040-3 92.6 40,000
GMNT060-3 92.6 60,000
GMNT080-4 92.6 80,000
GMNT100-4 92.6 100,000
GMNT120-5 92.6 120,000

GMNT Warranty

Goodman offers a limited lifetime warranty for the heater exchanger and a 5-year limited

warranty for all parts. In order to receive this warranty, homeowners must register their

product at within 60 days of purchase.

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