Adding Third Roof AC - Anyone Try It?

[f15epilot]

After spending an extended weekend in 100F heat, I’m ready to increase the AC capacity. I used a 13k BTU dual-tube portable AC unit this time and that kept temps fine, especially in the main cabin where it tends to get warm. But that solution is bulky and the condensation has to be emptied regularly. I’d like to add a third Penguin II to the roof. I know the 8kw QD8000 can handle the load, and I’m reducing the overall demand by replacing the 30A electric cooktop with an 8.5A induction cooktop.

So…rather than figure this out from scratch, thought I’d see if anyone had attempted this and how they did it. A unit would take 120AC for a stand-alone, and a zone temp sensor plus a CAN bus line if I want to integrate it. Looking for advice here. And before anyone offers suggestions on making the two existing Penguin IIs ‘work better’ they are both new and working to spec. Looking specifically for info on adding an additional roof AC to a two-unit Travel Supreme motorhome (mine is a 2006 ME), preferably in the front or middle.

Thanks in advance for the assist.

[1320Fastback]

I sold our 2015 dometic AC to someone that was adding another one to his trailer after we got our Atwood. Obviously you would have to run power wires to it and build a 14x14 box in your roof framing.

[Bikerdds]

I am in the same boat as you.
The real issue with our 2005 ME is the heat gain from the front window and according to several installers of reflecting material to reduce heat gain the problem there is the material isn’t big enough to cover in one piece and seams create issues.
I am also wanting to add a third unit. In my opinion needs to be in front. Minimal ducting should be necessary as it would virtually be mounted over the space between the front seats. Would need to aim at each seat and the glass.
I have been told that wires could be run thru the existing duct work back to the panel area as it is virtually impossible to wire otherwise.
Using the device that reduces start up current and staggers the units will keep breaker from tripping.
Getting someone to do it is the issue!
I added a fan to both front seats but still not enough. I live in Florida and have owned since new. Using the coach now more than ever and at times the heat is the pits. Normally not as bad when camping.

[BirchyBoy]

Originally Posted by Bikerdds

I am in the same boat as you.
The real issue with our 2005 ME is the heat gain from the front window and according to several installers of reflecting material to reduce heat gain the problem there is the material isn’t big enough to cover in one piece and seams create issues.
I am also wanting to add a third unit. In my opinion needs to be in front. Minimal ducting should be necessary as it would virtually be mounted over the space between the front seats. Would need to aim at each seat and the glass.
I have been told that wires could be run thru the existing duct work back to the panel area as it is virtually impossible to wire otherwise.
Using the device that reduces start up current and staggers the units will keep breaker from tripping.
Getting someone to do it is the issue!
I added a fan to both front seats but still not enough. I live in Florida and have owned since new. Using the coach now more than ever and at times the heat is the pits. Normally not as bad when camping.

Keeping the heat out is the first line of defense for good cooling. Their opinion on the window shade seems pretty off-base. Having two pieces of reflective material joined with a taped seam is a lot better than having none.