Replacement AC System w/ R32 Refrigerant for a Dometic Duo-Therm w/ 410a Refrigerant

Updated 07/11/2026 | Published 07/07/2026

Products Featured in This Question

Advent Air RV Air Conditioner System - 15,500 Btu - Single Zone - Ducted - White - R32

(577)

$833.00

Advent Air RV Air Conditioner System - 15,500 Btu - Single Zone - Ducted - Black - R32

(577)

$833.00

Question:

Hello, We recently purchased the ACM135. And noticed it wasn’t working properly with the existing Duo-Therm control box and thermostat. Are you able to send me a link to the correct distribution box and thermostat needed for this. Also we would like the furnace to be connected to this thermostat. Thank you

asked by: Jacob T

Expert Reply:

Hey Jacob. Unfortunately, we do not sell the air distribution boxes that are compatible with the Advent Air pn ACM135. That AC unit has the older 410a refrigerant in it and none of the newer air boxes are compatible. 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 both the Advent Air pn ACM135 and your Dometic Duo-Therm has the now obsolete 410a refrigerant.

My only option is to recommend returning your Advent Air pn ACM135 and replacing your existing Duo-Therm control box and thermostat with the Advent Air RV AC System w/ Wall Thermostat item # ADV99QR in white or item # ADV69QR in black. These are 15,500 btu systems with the new R32 refrigerant. They include an air distribution box that works in ducted orientations.

The thermostat included with the Advent item # ADV99QR in white or item # ADV69QR in black will allow you to operate your furnace.

What kind of RV do you have and does it have air ducts?

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