Lennox G26 Furnaces | FurnaceCompare®

Lennox G26 Furnace Overview

The Lennox G26 (discontinued) is a high-efficiency gas furnace offering 92% AFUE. This model was offered in in 4 different models with downflow and horizontal options.

The G26 was equipped with Lennox’s SureLight ignition system, which featured easy on board diagnostics with LED lights and was made of durable, silicon-nitride for long-lasting home heating.

Fully insulated cabinets and heating capacities of 50,000 to 125,000 BTUH are additional components of this unit.

Furnace Filters for the Lennox G26

Air Flow ConfigurationCabinet WidthFilter Size(s)
All16 1/4″14x25x1

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Consumer Reviews of Lennox G26


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #9 of 29 Lennox Furnace
  • 40% of customers recommended

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Lennox G26 Furnace Reviews

Showing 11-15 of 15 reviews

"Furnace from Hell"

1.0 rating
Very Unsatisfied

When I built my house in 1997 I installed a Lennox Elite g26. It has never worked for more than a few months at a time and has never made it through an entire heating season. Two circuit boards, heat exchanger, fan motor have all been replaced. Last year a wiring harness caught fire due to a short in a plugged connection. For the first 10 years the dealer replaced the parts and fixed it at no charge to me. Each time it was fixed we thought that would be the end of our trouble, only to have it go out again in a few months. Now they want to charge to fix it. It broke this past January, cost me almost $200 to fix it. Now in April it is leaking exhaust fumes into the house setting off carbon monoxide detector, so we shut it off. I have had it and won’t pay to fix this lemon. We asked Lennox to give us a new furnace, no reply as of yet.

"Lou Simmons"

1.0 rating
Very Unsatisfied

Purchased a complete System, Heat Pump/Air and a propane high efficiency g26q3-75-5 furnace. I have a four zone system. Heat exchanger failed this past winter. Serviceman switched power off to furnace in mid Jan. Lennox dealer ordered replacement but wanted $510.00 for labor. Lennox warranty states free replacement for the heat exchanger but will not supply heat exchanger to home owner nor will the Lennox dealer who has my heat exchanger supply it to another licensed installer. Lennox is protecting the Lennox dealers. Never buy Lennox again. Wish I new of a unit that would be a direct replacement and get rid of the Lennox junk.

Jones, MI

"Lennox G26"

5.0 rating
Very Satisfied

Installed a Lennox G26 14 years ago and have been very pleased with this unit. VERY energy efficient, I think even more than it is rated. Have had two parts replaced. An ignition switch and a blower control motor. I have noticed, over the years, the combustion air induction motor has gotten louder, with a sort of “vibration” sound. I guess after 14 years it may be dirty and/ or wearing out. The cost for the Lennox replacement part is about $250. Not sure how much labor would be to replace it. I plan to do it my self, as it seems easy. So all in all, I’ve been very pleased with the efficiency and have had just two problems over 14 years. I’ve had a service/maintenance agreement on the unit for most of the 14 years: heating checked once in the winter and a/c in summer.

St. Louis, MO


1.0 rating
Very Unsatisfied

During the ten years since I had this furnace installed (a G-26 model I believe) I have had a failure every year. The first three years I got warranty coverage then the installer went out of business so I pay again and again. I’ve replaced the blower motor two times; the low pressure switch; the draft inducer motor; the circuit board (which has apparently failed again so I’m looking to replace the furnace instead). The flame sensor needed cleaning every 6 weeks until one repairman jury rigged a non-standard sensor that really works about 4 years ago and the igniter was replaced a couple of winters back. I added it up and I’ve payed for this furnace 3 times in 10 years. No More.

Salt Lake City, UT


1.0 rating
Very Unsatisfied

I have owned a Lennox G26 for 12 years and finally decided to give up on it. It has been nothing but trouble since the day it was installed and is in need of constant repair. Chose Trane this time because of consumer reviews.


Other G26 Reviews

Although many HVAC contractors support Lennox products online, some consumer posts reflect disappointment and frustration with the G26. A consumer on diychatroom.com finds the LED diagnostic lights not very useful when trying to diagnose a system error. Simple fixes, consumers say, are made more complicated because the lack of activity on the board.

A conversation thread on ytmag.com highlights repairs, failing components, and hard-to-deal with repairmen. Hvac-talk.com also has many repair questions about the G26. From faulty ignitions to blowing cold air, consumers are unsure how to fix the unit without calling a professional.

Question and Answer


What is the efficiency of the lennox G23Q3/4-100-2


80% AFUE

Lennox G26 Model Numbers

The G26 is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
G26Q2-50* 92.3 50,000
G26Q3-4-100* 92.3 100,000
G26Q3-4-125* 92.3 125,000
G26Q3-50* 92.4 50,000
G26Q3-75* 92.3 75,000
G26Q4-5-100* 92.3 100,000
G26Q4-5-125* 92.3 125,000
G26Q4-5-75* 92.3 75,000

G26 Warranty

The G26 was equipped with Lennox’s basic warranty. The product did not require registration and is automatically eligible for receive a lifetime limited heat exchanger warranty and 5-year limited covered components warranty.

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