Adding a 3rd Air Conditioner

[glendodom]

We have a 2018 40' Montana, Model 3721RL which came with 2 ACs: 1 living room area 15,000 AC w/HP and a 13,500 AC in the BR.
These units run on a central duct system and are independently controlled by single zone Dometic Duro-Therm single zone thermostats versus controlled via the "In-Command" as later models.

The LR area has always taken an extended time to cool down when arriving at a campsite when the temps are up in the high 90s and likewise struggles during the mid-afternoons when temps are at the highest.



The RV came prewired for a third AC unit which I am considering adding a third unit.

As I understand, when running the 3 AC system there is a control panel that controls the BR and 3rd AC to ensure that all three compressors don’t kick in at the same time but subsequently you can run all three units, correct? I have read comments which indicated ya and nay? Who has 3 units installed that can clarify how the 3 unit system works?


I am looking at adding a low-profile, Penguin II, 13,500 unit, model 641816CXX1J0. (High Capacity Low Profile Rooftop Air Conditioner, Ducted or Non-ducted application - Pre-installed Multi-Zone CCC II control board)