Intertherm M1 Furnaces | FurnaceCompare®

Intertherm M1 Furnace Overview

The Intertherm M1is an 80% AFUE furnace for use in manufactured housing. It has an insulated cabinet which ensures minimum heat loss and quiet operation, and the cabinet finish is coated to protect against rust and corrosion. The M1 features an aluminized steel drum-style heat exchanger, a multi-speed direct drive blower and a sealed combustion system. The M1 is designed for all sizes of manufactured and modular homes, and all models are AC ready.

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Consumer Reviews of Intertherm M1


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #2 of 3 Intertherm Furnace
  • 0% of customers recommended

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Intertherm M1 Furnace Reviews

Showing 1-5 of 7 reviews


1.0 rating
Very Unsatisfied

I replaced my furnace 4 years ago. Since then, I have had to have it repaired 3 times at a cost of about $750. One time was the igniter, one time the exhaust motor, and one time the gas control valve. I would not recommend this furnace to anyone. All you people that are satisfied with yours, just wait until you replace it and see how much trouble you have. The new ones just don’t last.

Cottage Grove, MN

"Worst furnace ever!"

1.0 rating
Very Unsatisfied

Number 1 problem, the circuit board mounted on the fire box causes furnace to malfunction; easily fixed by putting insulation behind the board. Number 2, when you have to apologize to your neighbors because your furnace is making too much noise, you’re just not going to get much sleep at night. Avoid buying this piece of junk.

Moonachie, NJ

"Total POS!"

1.0 rating
Very Unsatisfied

This unit came with my new home and when it was 1 month out of warranty (13 months old – can you believe that?) it required an $804 booster motor and pressure switch. This company’s 1-year warranty sucks, it pretty much says how much faith they have in their product, and their customer service sucks even more! The service guy that came to work on it also said that the main blower motor isn’t long for this world either, based on its extremely noisy operation. If you have a choice, absolutely do not buy this piece of crap product! I know that once this unit becomes too expensive to keep running, I’ll be very careful to never buy another product from Intertherm – ever!

Boulder, CO

"Replaced switch"

1.0 rating
Very Unsatisfied

This furnace was installed in our mobile home upon agreement to purchase the home April 16, 2012. We have had problems with the switch #632453r ever since the first winter season of 2012. To date, we have replaced this switch for the fourth time; once in 2012, twice in 2013 and today, November 1, 2014. There is a definite problem with this switch and Nordyne, the manufacturer of this furnace, which is Intertherm, has to come up with a solution. The furnace will not operate once this switch goes. I have no alternative within my space to use any other kind of furnace. My choices are very limited. I called Nordyne within the first year of having this furnace and they told me it was not under warranty. The documentation says one year parts and labor. I do not recommend this furnace, simply because of this faulty switch that keeps breaking or wearing out.

Carleton Place, ON, Canada


1.0 rating
Very Unsatisfied

This unit is so loud the neighbors can hear it when it’s running. We installed a door down the hall where the unit is located, to try and muffle the noise. Several months later we had a repairman come out and service the unit because the vents stopped blowing cold air. The serviceman told us we could not close the door we installed because air cannot circulate through our house, and it is working harder to cool our house. So we are still living with the loud noise it makes. I would not have another one of these units if they were giving them away.

Ashville, Al.

Other M1 Reviews

Based on the very few comments about the unit on HVAC forums, the M1 is regarded as a good furnace. A reviewer on had an issue with his M1, but it turned out that the problem was caused by the thermostat and not the furnace.

Intertherm M1 Model Numbers

The M1 is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
M1MB-056* 80 56,000

M1 Warranty

The Intertherm M1 Furnace is covered by a 10-year heat exchanger warranty and a 1-year parts, labor and mileage warranty. A Contractors' Preferred Protection Plan is available to extend the parts and labor warranty to 5 or 10 years.

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