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Lennox G40UH Furnace

1.7 of 5 stars 6 reviews | #22 of 26 Furnaces
Updated: Dec 28, 2016 | Read more about Lennox Furnaces | G40UH Warranty

Furnace Filters for the Lennox G40UH

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

Consumer Reviews of the G40UH

1.7 1.7 of 5 stars 6 reviews
  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
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1 of 5 stars Kennesaw, GA
Date created: 2016-12-28

Many many service calls

This system is made so cheaply. Strongly I do not recommend to anyone to use. Too may fails because of poor quality. I lived in 4 houses, and used all different systems, but Lennox this model only fails all the time and have to pay $$$ every time I call the service.

5 of 5 stars Walled Lake, MI
Date created: 2015-12-31

My Trusty Furnace

I have had my furnace for over 10 years now. It was installed 3 years before I bought the house, so it is over 13 years old now and I have never had a problem with it. The furnace was made by Lennox. It is a hot air furnace that uses natural gas and is of sufficient capacity to heat my whole house even in the coldest of weather. The furnace is of pleasant appearance and simple design that requires very little maintenance. It is located in a closet in my basement next to other major appliances. I once had a maintenance man come in to check the furnace out. There was nothing wrong I just wanted to know if it needed maintenance or adjustments. Nothing was needed so now all I do is change the air cleaner every 3 months. I like it because I never had any problem with it. If it ever needed replacement I would buy the same brand again and I would certainly recommend it to a friend.

1 of 5 stars [email protected]
Date created: 2011-11-05


What a joke! This is the 2nd Lennox g40uh-24a-045x* furnace that we have purchased in the last 15 years. You think that we would have learned after the 1st time. Once again the furnace is running continually and it will not shut off. Last time the furnace would not turn on and they told us it would be cheaper to buy a new furnace then replace the circuit boards. Ha ha! I will never purchase another Lenox furnace. They are a piece of junk and the company should be investigated for selling inferior products. If you are thinking about purchasing a Lennox product don't!!!

1 of 5 stars
Date created: 2010-05-25

Continual Break Downs

We have a g40uh gas furnace installed in late 2005. I have just made my 4th service call due to a wire coming loose causing the fan to not start. While seemingly simple due to the cheap parts in this model, it will not stay fixed and short of spending thousands for a new unit Lennox has no solution. I was happy to see a Lennox unit but now am wondering if the former quality of the brand is long gone.

1 of 5 stars
Date created: 2010-03-21

Lennox furnace

I have a 3 year g40uh (X)series Lennox gas furnace that does not blow heat. The technician charged $124 to fix the combustion air inducer. He said that the motor for this model has been painted on the inside and the paint become flaky with heat and ultimately will clog the motor. The replacement motor has also been painted and his recommendation is to buy a new American Standard Ace model gas 80% furnace. Does anyone know if this interior paint problem of the motors is real?

1 of 5 stars
Date created: 2009-10-04

Lennox Gas Furnace

The builder installed a Lennox g40uh(x) series gas furnace In the last 3 years when it is time to turn on the furnace, the tube passageway to the air flow was clogged not allowing the burners to light up. Does anyone know why this is happening and can tell me what to do to prevent this from happening

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Lennox G40UH Model Numbers

The G40UH is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
G40UH-36A-070* 80 66,000
G40UH-36B-090* 80 88,000
G40UH-48B-090* 80 88,000
G40UH-48C-110* 80 110,000
G40UH-60C-110* 80 110,000

G40UH Warranty

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