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Goodman GMS8 Furnace

2.7 of 5 stars 10 reviews | #9 of 20 Furnaces
Updated: Dec 30, 2017 | Read more about Goodman Furnaces | GMS8 Warranty

Overview of GMS8

The GMS8 furnace has an AFUE rating of 80%, which makes it a low-efficiency furnace relative to other new furnaces.

The GMS8 furnace includes features such as a tubular heat exchanger and a corrosion-resistant blower, a durable hot surface mini-igniter, and self-diagnostics on the control board.

Furnace Filters for the Goodman GMS8

Air Flow Configuration Cabinet Width Filters
Upflow / Horizontal 17-1/2" 1 14x25x1 filter
(bottom air return)
Upflow / Horizontal 21" 1 16x25x1 filter
(bottom air return)
Upflow / Horizontal 24-1/2" 1 20x25x1 filter
(bottom air return)
Upflow / Horizontal All 1 16x25x1 filter
(side air return)

Consumer Reviews of the GMS8

  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
best product icon  What are the 10 Best Furnaces?
2 of 5 stars Atlanta, GA
Date created: 2017-12-30

10 years and running

House built in 2007, bought in 2010. Provides good heat. Had to replace the Control board 2 years ago due to cold solder joint. Repaired myself and have a backup in case the new one goes bad. This week the flame sensor stopped the gas flow right after ignition due to being dirty. Not bad after 10 years of use. My recommendation to the average homeowner is to have your furnace serviced once a year. Find a highly rated technician and they will find most problems before they happen. Unfortunately our homes require maintenance and homeowners usually fail in the performance. I can't stress enough, perform predictive and preventive maintenance to save yourself some stress. Have a great day!

1 of 5 stars Twin Lake, MI
Date created: 2017-11-02


Very unhappy with this unit. 3 years old and 3 service calls for the same thing.

4 of 5 stars Homewood, IL
Date created: 2017-06-02

Design Failure?

Furnace has operated well: even heat; quiet. One rather annoying factor is that the machine was not designed to accept a filter! I don't understand how this can today. Prospective buyers of a Goodman furnace would do well to contemplate this lack and what it might mean to them in their building.

1 of 5 stars Kansas City, MO
Date created: 2017-05-15

Scrap metal!

Scrap metal! 2017 and less than 6 months the control board has gone out. Goodman distributor says not his problem and to call the install people. Now I am finding all these reviews that are showing me my future with this piece of crap and I am out of $$

5 of 5 stars Portland, OR
Date created: 2015-12-23

Goodman Gas Furance

I have owned this furnace for about a year. The things I love about this furnace are the dual-diameter tubular heat exchanger, the very quiet single-speed, induced-draft blower, and the quiet multi-speed direct-drive circulator blower motor. All this for a very affordable price. What I dislike about the product is what seems to be the lack of efficiency. But the price is what you pay for. I have only had it for about a year so therefore I have not had to have this unit repaired, this does come with a 10 year parts warranty. If one was on a budget and looking for a very simple furnace, I would recommend this product to a family member or a friend.

5 of 5 stars Gainesville, FL
Date created: 2015-10-05

Great quality at a reasonable price!!!

I bought this furnace because I am remodeling a house and have had it around 4 months. It is extremely quiet, works really fast, and the only negative I can say is it was a tad bit to pricey. I never had to replace or fix it and I will say I will buy this brand again if something happens to this version. I have told a friend about it who is also remodeling a house.

4 of 5 stars Wethersfield, CT
Date created: 2015-05-08

Great Furnace Replacement

So this is the first time I've ever had to purchase a furnace and I was very nervous. For one thing, I wasn't sure how much a furnace ought to actually cost. I spent about three days collecting information from the internet, from dealers and repairmen, and from friends who have needed to replace theirs. I finally settled on a Goodman. The reason for this was that I was told that it was a brand that most repairmen were comfortable and familiar with installing. This couldn't have been more incorrect. I called two different companies and both said that they wouldn't install a furnace I bought through a 3rd party. The third company I called finally sent someone out and they were unable to install it. Eventually I ended up calling my father-in-law, who had been an oil guy for 20 years, and we installed it together one afternoon. Since then, I can't have been happier with the performance. My heating bill has gone down and it's a lot quieter than the old guy. Couldn't be more satisfied, even though it was tough to get it installed.

1 of 5 stars Kirkland, WA
Date created: 2014-12-15

Cheap to buy but expensive to repair

The unit is 6 years old and seems to need annual repairs of $600 plus. The igniters last 2 years, and the blower motor died. It's noisy. There's not much good to say. It came with the new house. The contractor obviously didn't care about quality.

3 of 5 stars Staten Island, NY
Date created: 2014-06-04

Check that Control board before replacement

Bought this unit in 2008, with matching a coil and Condenser unit. It bore the Coleman Name then. Just yesterday the ac shut down, trouble code was 5 red flashes. Roll Out switch, the unit is calling for cooling. Roll Out is a heating malfunction. Wtf! Checked all 4 roll out switches for continuity all ok. Checked wiring loop of the 4 roll out sensors back to the control board 12 pin plug cot continuity through the whole loop. Before purchasing and installing a new control board I removed the failing one and examined it with a magnifying glass and found a cold solder joint on one of the pins of the 12 pin connector and it was a Roll out sensor pin. Reflowed the solder on all 12 pins and the unit was again 100%. Don't be too quick to let a repairman sell you a new control board without checking all the connection points for poor soldering from the factory!

1 of 5 stars
Date created: 2010-02-12


I purchased a Goodman gms8 gas furnace in January 2005 and it ran good. Until 2 years later, we had to replace a major part which my husband hired/paid a repairman for but we never got to keep the replaced part to see if it was warrantied (which is another matter I am not happy about). The following year in 2008, another problem and then again this winter, we've had a repairman come out twice which he told us we eventually will need a certain part that my husband was able to order online and install himself which saved us a bundle. We are hoping we won't have further problems. My daughter is looking for a new furnace and I don't think I will recommend Goodman.

Other GMS8 Reviews

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Goodman GMS8 Model Numbers

The GMS8 is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
GMS80453AN* 80 45,000
GMS80703AN* 80 70,000
GMS80704BN* 80 70,000
GMS80904BN* 80 90,000
GMS80905CN* 80 90,000
GMS81155CN* 80 115,000
GMS81405DN* 80 140,000

GMS8 Warranty

To benefit from the Goodman warranty, customers will need to register the unit within 60 days of installation at the original owner’s home. Once this is completed, the following warranty applies.

  • The heat exchanger is covered for the life of the original home owner
  • All other functional parts will carry a 10 year limited warranty

If the above warranty does not apply then the product is covered as follows:

  • All other functional parts will carry a 10 year limited warranty
  • The heat exchanger will carry a 10 year limited warranty
  • The remaining functional parts carry a 5 year warranty

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