Will Mach-C Everest System Operate Existing Furnace

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Question:

hello, i have an Advent 13.5k btu that cant keep up. Want to install coleman Mach C everest complete kit. Will this still work with my current heat furnace controls? thanks in advance. Gene.

asked by: Gene

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Expert Reply:

Hey Gene! Mach-C Everest Variable Speed RV AC System # CM35MR will work with your existing furnace. This is a complete replacement so you will install the new rooftop unit, air distribution box, and wall thermostat. The new Coleman thermostat will control the AC as well as your furnace. This will be a really nice upgrade over the Advent that will keep you cool in almost any conditions.

What kind of trailer do you have and where do you usually go camping?

expert reply by: Robin H

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Mach-C Everest
(click to enlarge)

Gene

7/25/2026

Thanks for the help.! That answers what I need to pull the trigger. I have a crossroads Volante 310bh. We use it for travel work in Texas. Hottt and need a serious upgrade

Robin H.

7/27/2026

@Gene you're welcome! This will definitely help you beat that Texas heat.

J-rod

9/13/2026

Hate to piggy back off of this but may be helpful to others as well. How do you attach your furnace to the unit/ thermostat? I know it has a 12v and a furnace wire but I'm trying to understand how to make this work with my Atwood furnace.

Robin H.

9/14/2026

@J-rod the furnace connects at the Everest control box rather than directly to the wall thermostat. You will connect the furnace's call-for-heat wire to the furnace lead on the Everest control box, and the Everest thermostat will then control the furnace through that connection.

J-rod

9/14/2026

@RobinH so does that mean I should run the 12volt wire from the furnace and the other leg that was on my thermostat to the brown furnace wire off the AC unit?

Robin H.

9/14/2026

@J-rod no, you don't want to connect both wires to the brown furnace wire. Of the two wires that were connected to your old thermostat, use a multimeter to identify which one has 12V power. Cap off that powered wire, and connect the other, non-powered furnace wire to the brown furnace wire on the Everest. I believe that matches what Kevin did exactly in the installation video below.

Helpful Links

tv-install-coleman-air-conditioner-2011-sunnybrook-brookside-fifth-wheel-trailer-cm35mr.aspx

Answer 1

Hey David, you can replace your Coleman Mach 15 with the Coleman Mach Everest part #CM35MR and use the same wiring that's behind the walls. Everything else would need to be swapped out but the wiring can be reused. We only have the Everest in the…

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Answer 2

Hey Kyle! That is correct. The Coleman-Mach Mach-C Everest has variable-speed cooling and an inverter-driven compressor. However, the Mach-C Everest uses a traditional wall thermostat instead of a remote control. It also works with both ducted and…

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Answer 3

Welcome back James! I recommend the Mach-C Everest Variable Speed RV Air Conditioner System item #CM35MR in white or item #CM55MR in black. These are complete AC systems that include an 18k variable speed air conditioning unit, an air distribution…

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Answer 4

Hi Travis! You will not need to keep two separate thermostats. I completely understand the confusion because some of the information for the Coleman Mach Everest VS 18 thermostat makes it sound like it only handles the air conditioner, but the…

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Answer 5

Thanks for reaching out. Based on what you're looking for, I recommend the Coleman-Mach Everest Variable Speed RV Air Conditioner System - 18,000 Btu - White #CM35MR. It gives you a nice bump in cooling capacity over your existing 13,500 Btu…

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Answer 6

Hey Stephen! The Coleman-Mach Mach-C Everest #CM35MR is a complete system so it comes with everything you need to replace an Advent Air AC135. Complete replacement is required since you're moving from an R410A to an R32 system. This works with…

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Answer 7

Hey Richard, so we can definitely help but what we have found is that the Furrion Chill Cube RV AC units like the #FR59TQ which has the heat pump in it and was designed for ducted applications like it sound like you have just don't work well with…

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Answer 8

Hey Edward, the Coleman Mach Everest part #CM35MR would be a really great option to replace your Coleman Mach 15 as it's very quiet, blows very cold, and also draws a lot lower amperage. Only issue is that it's not available for a couple…

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Answer 9

Hey James! The Coleman-Mach 48000 series in your 2025 Jayco Northpoint is unfortunately now an outdated model because it uses R410a refrigerant which was discontinued in 2025, so it won't use the same wiring as the Coleman-Mach Everest series…

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Answer 10

Hey Matt, this is a really well written and great question but the Coleman Mach Everest #CM35MR can't be operated in the same way as the previous AC unit you have because it has a variable speed compressor so it's activation is totally…

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Answer 11

It sure can Larry. The Mach-C Everest Variable Speed RV Air Conditioner System item #CM35MR includes an air distribution box that can be used for a top down set up. There's a baffle built into the air distribution box that can be removed to push…

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Answer 12

Hey Bill, the Advent AC #ACM135 you're looking at will work great as a replacement for your Coleman AC and will let you use your existing setup with the Coleman adapter #ACCOLKIT.

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Will Mach-C Everest System Operate Existing Furnace

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