Can a rooftop a/c be added if there is not a roof vent?

kmb1966 wrote:
We have basement a/c with problems ...

.... an option for me or do I continue down the road of figuring out what is wrong with the basement a/c and work with that existing basement system.

Take a vacation in Elkhart, the nice folks at National RV Refrigeration will likely be able to fix your existing unit for a lot less than you could find any other solution.

You won’t lose your quiet ducted system that way either.