Lennox G61MP Furnaces | FurnaceCompare®

Lennox G61MP Furnace Overview

The G61MP is a high-efficiency gas furnace from Lennox. With more than ten models available, heating capacities in this series range from 44,000 to 132,000 BTU/H and models can reach up to 95 percent AFUE. Units can be installed in upflow, downflow, horizontal right and left positions.

Featuring two-stage heating, the manufacturer explains that the G61MP can help increase efficiency by operating on a lower heat setting until a change in the temperature is detected. At that time, the unit will automatically transition to a high heat setting.

Additional features of this series include: an aluminized stainless steel heat exchanger, continuous low-speed fan, insulated blower compartment to decrease operating noise, and a diagnostic control board. All units are equipped for use with natural gas, but kits are available for conversion to LPG operation.

Furnace Filters for the Lennox G61MP

Air Flow ConfigurationCabinet WidthFilters
All 17-1/2″ 16x25x1 (side)
16x25x1 (bottom)
All 21″ 16x25x1 (side)
20x25x1 (bottom)
All 24-1/2″ 16x25x1 (side)
24x25x1 (bottom)

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Consumer Reviews of Lennox G61MP


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #9 of 29 Lennox Furnace
  • 37.5% of customers recommended

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Lennox G61MP Furnace Reviews

Showing 1-5 of 8 reviews

"Excellent furnace"

5.0 rating
Very Satisfied

I have had this furnace since October 2004 (15.5 years) and just had my first problem. I had to replace the blower assembly at a cost of $500 Canadian. Up to this point, I have never had it serviced, other than replacing the filter, which I do annually. It works great. Overall, I am very pleased with this furnace.


"Efficient but not reliable"

2.0 rating
Somewhat Unsatisfied

Unit is 8 years old and still under warranty. This means I pay for all labor costs. Always maintained professionally. The problem is when they fail, they are so complicated that technicians don’t know how to fix them. It seems like factory tech support from Lennox is frequently inadequate. That is also a big problem. When functioning properly I am very happy and it keeps my home extremely comfortable. The problem is when it needs repair. I have been dealing with a poorly functioning furnace for a week now with below freezing temps outside and the HVAC techs can’t seem to fix it. I have tried several companies over the years due to competence concerns and so far they are all inadequate to my view. I recommend purchasing the system with the simplest design. I would not buy another Lennox again.



1.0 rating
Very Unsatisfied

6 years after the installation the inducer blower, flame sensor and ignitor had to be replaced. Even though the parts were still under warranty, the labor was quoted over $600 to replace these parts. Unacceptable with the labor charges and the parts breaking down after only 6 years. The old York heating/ac unit was much better.

Middletown, DE

"Best furnace I think I have ever owned"

5.0 rating
Very Satisfied

I have personally owned this furnace for about 6 months. It is a few years old. It was in the house that we purchased last year. It is very efficient and cost effective. Our heating bills seem to be about half of what they were when we were renting a townhouse. It keeps the house at a steady temperature throughout the day without running constantly. I like that is quieter than most furnaces I have dealt with in the past. When we had our home inspection, the inspector said it was almost like new. He thinks we will have this furnace for many years to come. We have not had to have any repairs or even the inkling of something wrong. A couple things I don’t like is that it does not have a humidifier on it. I was told that is an option that we could have added later if we wanted to. I have not personally checked into this to see if it is true. The other thing is that it does not seem powerful enough to heat the master bedroom, which is an addition. That may be the previous owners doing as far as not venting something right. The rest of the house is always warm and cozy. I would definitely purchase another Lennox furnace if the need ever arises. I would also recommend this brand to all of my family and friends. Lennox seems to be a very well trusted and well known brand in this area.

Swartz Creek, MI

"Heat exchanger"

1.0 rating
Very Unsatisfied

I just had to have my heat exchanger replaced after only 4 years and there’s no guarantee it will last another 5 years.

West Vancouver, British Columbia, Canada

Other G61MP Reviews

Although there are quite a few troubleshooting inquiries posted around the web, consumers and contractors generally like the Lennox G61MP. Homeowners on hvac-talk.com are happy with this unit, noting its quiet and efficient operation. Contractors also recommend this unit to shoppers, saying that if it’s installed correctly it should give years of quality performance.

Among the positive reviews, forums including justanswer.com host a handful of troubleshooting inquiries for this unit. Problems such as the igniter not working, faulty control boards, the unit failing to fully heat, and component failures are among the issues reported.

Question and Answer


What does a 4+3 code on my G61MP mean?


A 4+3 code on the Lennox G61MP is a Watchguard code which means “Exceeded maximum number of retries or last retry was due to flame failure”.

Lennox G61MP Model Numbers

The G61MP is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
G61MP-36B-045-* 94.1 44,000
G61MP-36B-045-** 94.1 44,000
G61MP-36B-070-* 94.1 66,000
G61MP-36B-070-** 94.1 66,000
G61MP-36B-071-* 95 66,000
G61MP-48C-090-* 94.1 88,000
G61MP-48C-090-** 94.1 88,000
G61MP-48C-110-* 94.1 110,000
G61MP-48C-110-** 94.1 110,000
G61MP-60C-090-* 94.1 88,000
G61MP-60C-090-** 94.1 88,000
G61MP-60C-091-* 95 88,000
G61MP-60C-091-** 95 88,000
G61MP-60C-110-* 94.1 110,000
G61MP-60C-110-** 94.1 110,000
G61MP-60C-111-* 95 110,000
G61MP-60C111-** 95 110,000
G61MP-60D-135-* 94.1 132,000
G61MP-60D-135-** 94.1 132,000

G61MP Warranty

The G61MP is equipped with a 5-year limited warranty on all covered components. In addition, Lennox offers a lifetime limited warranty on the heat exchanger. Homeowners should contact a local dealer for registration information specific to their unit.

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