Replacement Digital Thermostat for 2023 Holiday Rambler Admiral Motorhome

Updated 11/10/2026 | Published 10/13/2026

Question:

I need a new thermostat for my 2023 holiday rambler admiral. I would like a digital type if possible

asked by: Paul M

Expert Reply:

Thanks for reaching out Paul. We can definitely help you upgrade to a digital thermostat in your 2023 Holiday Rambler Admiral motorhome. The important thing is making sure the new thermostat is compatible with your existing air conditioning system. Unlike residential thermostats, RV thermostats are specific to the A/C manufacturer and control system, so they aren't interchangeable between brands. Another consideration is the refrigerant change that occurred in 2025. Newer RV air conditioners use R32 refrigerant, while older systems commonly used R410A. Along with this change, manufacturers redesigned many of their control boards and electrical components, so newer thermostats and controllers are not backward compatible with older systems. For example, the Advent Air RV Air Conditioner # ACM135B you were looking at is one of the few replacement rooftop units we still carry that uses the older R410A refrigerant.

Do you see any manufacturer branding, model numbers, or part numbers on your current thermostat? If you can send me that information I'd be happy to help identify a compatible digital replacement.

expert reply by: Christopher H

Paul

11/6/2026

part # AR7815 sorry for the delay getting back.

Christopher H.

11/6/2026

@Paul Thanks for getting back to me. Is your existing AC single zone and does it have a heat pump? Do you use the existing thermostat to control the furnace?

Paul

11/6/2026

@ChristopherH single zone ac no heat pump and yes my thermostat controls both AC and Heat.

Christopher H.

11/6/2026

@Paul Gotcha. The simplest swap for a digital thermostat for you would actually be a part that we don't carry. You should be able to find it relatively easy online. It would be the Coleman Mach Digital Wall Thermostat 8330-3862. This would be a drop in digital upgrade and will wire up the exact same as your existing thermostat. Something like the # CM76RR would likely work as well but is typically meant for units with heat pumps so wiring it up could prove difficult and there's also a good chance it wouldn't work with your existing air distribution box.