Replacement AC System for a 15,000 Btu Dometic Duo-Therm

Updated 06/06/2026 | Published 05/31/2026

Products Featured in This Question

Advent Air RV AC System w/ Wall Thermostat - 15,000 Btu - Ducted/Non-Ducted - Black - R32

(254)

$967.63

Question:

looking for a replacment air conditioner for a 2003 keystone montana 2955rl with a 15000 duo therm

asked by: Raymond J

Expert Reply:

Hey Raymond welcome back! To replace your 15,000 btu Dometic Duo-Therm, I recommend the Advent Air RV Air Conditioner System item # ADV92SR in white or item # ADV62SR in black.

There's no way to just replace your AC unit, you'll need to replace all your AC system components. This is due to the EPA changing the regulations on the refrigerant in the AC units at the beginning of 2025. They've been upgraded to R32 and your Dometic Duo-Therm has the now obsolete 410a refrigerant. None of the 410a components are compatible now with the newer systems. You will be able to use the existing wiring to power the AC system and connect the new thermostat if yours has one.

The Advent Air RV Air Conditioner System item # ADV92SR in white or item # ADV62SR in black are 15,000 btu systems that include an air distribution box that works in both ducted and ductless orientations. These systems also come with a start capacitor that stores up energy. It's going to really help when the compressor kicks on and needs to draw excess power. Also included is a thermostat that can use your existing wiring if your system has one.

Does your current AC system have a thermostat and do you have air ducts in your trailer? I'm just trying to dial in the right system for you. We've got quite a few replacement options and I understand swapping out everything to replace an older AC unit wasn't what you had in mind.

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expert reply by: Jerred H