I just had to share this info.
I have a friend who replaced his rooftop a/c unit 3 times in 5 yrs, and as he said, he could have bought another RV with what he spent on replacement a/c units.
I joked with him one day about retrofitting a window a/c unit to a roof mount.
Well, he said we need to work on that idea. So,, with old rooftop a/c removed, we set a $99. wallymart 5,K btu window unit up on top. Then we estimated and guestimated what we would need for duct work. Home depot here we go.
We found some duct work and headed back home.After some crimping and trimming, we had the cold air vents from window a/c going down into the roof hole. After using some plumbers strap, the unit was secured. Time to plug it in and see what happens. The unit came on, and was blowing some nice cool air, just like the old rooftop originally did.The original plastic cover was put on and it looked pretty good. He let it run for about 3 hrs and it cooled off his rig nicely. (he has a 22 ft tioga class C motorhome).
The following day we had to run a C channel from drip tray for the condensation to drain off to the side of the RV. No one would really know its a window a/c up there with original RV a/c cover over it. He finally hard wired the a/c into the existing a/c 110 V wiring. Its been almost a year, and he said its still working like a charm. I kinda laugh at this idea because it actually worked LONG term. And he doesnt have to worry about having his a/c unit hanging out a side or back window.
I guess we are only limited to our own imagination.
Is this *hill-billy,,Red-neck,or backwoods rigging? I really don't know, but it worked.