I posted this in another thread earlier today... just copying it here...
OP, if you haven't done this, it should be something you should look into as it only costs a little time and very little money... cheap is always good :)
I've also got a single AC unit on my TT and was having issues with it cooling properly. I did some research and ended up watching a few videos:
https://www.youtube.com/watch?v=E_GNjfFpTGUhttps://www.youtube.com/watch?v=AzdQoDublzsThis is not specific to certain models, really it most likely involves roof mounted AC units. I went ahead and used aluminum ducting tape to completely seal up the main unit and also better sealed the AC registers so those didn't leak too. Tightened the four AC mounting bolts to know no air was leaking out there too.
I can't begin to tell you how much of a difference sealing up the AC unit and registers makes. We all know RV construction can be marginal at best and this also seems to be with sealing of the AC units. My TT is even on the better materials and construction side but still, the AC unit was improperly sealed. I used to have issues cooling my TT when it was in the low 90's, sometimes I could not cool the trailer below 85 degrees. As an example, we recently returned from Moab, in July, where temps reached 108 degrees. I was camped in shade but I was able to maintain a set inside TT temp of 74 degrees.
That recent trip also had us in Capitol Reef area, Glendale, UT near Zion and Glenwood Springs where daytime highs were no lower than 85 degrees and in some places mid 90's with no shade. I never had an issue maintaining an inside temp of 74 degrees.
