Goodman GMS8 Furnaces | FurnaceCompare®

Goodman GMS8 Furnace Overview

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 Filter Size(s)
Upflow / Horizontal 17-1/2″ 14x25x1 (bottom)
Upflow / Horizontal 21″ 16x25x1 (bottom)
Upflow / Horizontal 24-1/2″ 20x25x1 (bottom)
Upflow / Horizontal All 16x25x1 (side)

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Consumer Reviews of Goodman GMS8


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

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Goodman GMS8 Furnace Reviews

Showing 6-10 of 10 reviews

"Great quality at a reasonable price!!!"

5.0 rating
Very Satisfied

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.

Gainesville, FL

"Great Furnace Replacement"

4.0 rating
Somewhat Satisfied

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.

Wethersfield, CT

"Cheap to buy but expensive to repair"

1.0 rating
Very Unsatisfied

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.

Kirkland, WA

"Check that Control board before replacement"

3.0 rating

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!

Staten Island, NY


1.0 rating
Very Unsatisfied

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

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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