Best Replacement AC for Dometic Duo Therm 57915.531  

Question:

Expert Reply:

Hey Keith! I can definitely help you find a replacement for your Dometic Duo Therm. However, you're going to have to replace the thermostat and air distribution box as well.

Your current setup is for R410A and everything switched to R32 last year following EPA regulation. The new AC units operate at different pressures and temps, and communicate differently, so they aren't backwards compatible with your current setup.

If you want the new 15,500 Btu Advent Air AC you looked at that would be the # ADV99QR (White) or # ADV69QR (Black) for the complete system. This includes the ADB and wall thermostat, with a capacitor # ACMSCKIT available separately.

If you want the absolute best replacement that would be the Furrion Chill Cube. The Chill Cube takes advantage of the R32 and uses a variable speed compressor. This makes it incredibly efficient and quiet. You can choose from the following based on ducted/ductless and color:

-Furrion Chill Cube RV Air Conditioner w Air Distribution Box - Ductless - 18,000 Btu - Black # FR27TD

-Furrion Chill Cube RV Air Conditioner w Air Distribution Box - Ductless - 18,000 Btu - White # FR59TD

-Furrion Chill Cube RV Air Conditioner w Air Distribution Box - Ducted - 18,000 Btu - Black # FR39TD

-Furrion Chill Cube RV Air Conditioner w Air Distribution Box - Ducted - 18,000 Btu - White # FR99TD

The Chill Cube is really easy to install, and uses a remote that also acts as the thermostat. Heat pump models are also available if that is something you're interested in.

What kind of trailer do you have?

expert reply by: Robin H

0

Advent Air RV AC
(click to enlarge)

Keith D.

5/28/2026

I have a 2006 Keystone Cougar camper. I do not have the inner serial number on me as we speak

Robin H.

5/28/2026

@KeithD that's ok, the answer still stands regardless of a serial number or anything like that.