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.

Questions about this model?

Consumer Reviews of Intertherm M1


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

Read Reviews of Other Intertherm Products

Find ratings and reviews for Intertherm Air Conditioners, Furnaces and more

Read Reviews

Top 10 Furnaces

See who made our list of the best Furnaces of 2020.

See the Top Products

Find a Certified Heating & Cooling Professional In Your Area

Contact a top-rated local expert to help with all of your home's HVAC needs.

Intertherm M1 Furnace Reviews

Showing 6-7 of 7 reviews

"Not a Happy Camper!"

1.0 rating
Very Unsatisfied

I needed a new furnace in December of 2009. The company I used at the time replaced the old one with the same brand Intertherm M1MB-090*. I live in a mobile home, which only leaves me w/ a couple of choices. Ever since it was installed I have said it did not heat as well as the old one. They checked the air flow & temperature & said it was up to par. It still does not heat as well no matter what they say. Now the bearings in the draft inducer motor are “Defective”, that’s what the repair man wrote. They said it would be $455 to fix. The part is defective for crying out loud. The furnace only has a 1 year warranty. I think this crap about having to buy extended warranties is for the birds. Make a good product, stand behind it, & quit gouging the little people!!!

Mantua, Oh

"Outdated and inefficient."

3.0 rating

I have owned my furnace for eleven years now. It is an eighty percent propane furnace that has an output of forty-five thousand BTU’s. I like it for the warmer heat that I feel when it comes on and for when the power is out, my small generator will run it with no problem as it uses gas for the source. I do not like the cost of feeding this furnace propane with the rising cost of fuel. I say it is outdated and inefficient in my title because there are newer and better gas furnace products on the market that can save me a larger chunk of change both in heating my home and in operating cost. I am neutral in my standing on it as I have only had to replace the thermocouple since owning it which makes it reliable but, I feel it does not adequately heat my home and is costly to use. I may buy and recommend the same brand only if I could get a ninety percent furnace instead by that manufacturer.

FairPlay, MO

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.

HVAC Brands

Learn more about your home's heating and cooling system with our guides, how-to's, FAQ's, tips and more.

Ready to get a quote from an HVAC contractor?

Let us know what type of service you need and we can connect you with a certified local HVAC contractor.

Please enter a valid name

Please enter a valid phone number

Please enter a valid zip code

There are no dealers in this zip code.

Please enter a valid email address

Please select repair or replace

Please select heating, cooling or both