GottaRunGottaCamp wrote:
here is a mod, that will improve your AC unit
clicky
OP, I have a 32' with a large slide and only 1 15K AC unit as well. We have always struggled in the hot humid summers to keep up with cooling. The AC would be on all the time in the summer at the lake without tree cover. We put reflectix in the windows to prevent as much heat coming in and we got the window screens on the outside to prevent heat as well. It was better, but the AC would still run all day long and it would be cooler, but never got to temp during the day.
Last spring I did this mod and it was an amazing difference. It was so effective that my FIL asked me to do his, and we camped with friends in Tennessee and they asked for help modding it too.
The AC is so horribly designed, you get plenty of cold air that dumps into that box, then loses air pressure and doesn't go into the ducts and ultimately cool off the camper. Putting in those channels isn't perfect, but greatly improves the airflow and reduces the turbulence and noise from the box that it used to dump air into.
When we were at the lake this past summer after the mod, I came in at one point and the AC was off. I thought one of the kids might have messed with it, but I looked and it had just cycled off because it had hit the set temp. I was amazed, the mod really helped!
That said, if you add a second AC, I would also recommend that you add the Soft Start capaciter to your existing and your new unit. They will really lower the startup draw of the AC unit. It puts a lot less stress on your wiring and your AC.
2015 Ram CTD
2015 Jayco 29QBS