[Guy]

Have you contacted Shelburne R/V in Cleveland Tn,  ( Chattanooga ) ? They are basement a/c specialists. They also have several r/v repair companies around the country that they have taught the ins and outs of basement air. 

We were going to visit them to bring our two non op  a/c back from the dead, but we discovered an HVAC man in a remote area in Texas willing to learn about ours, and see if he could do the work. He was successful on 1 unit, and now will do his best on unit 2

You can also find many basement air repair/replacement  videos by them on U-tube

www.shelburnerv.com/basement-a%2Fc-1

Steve Shelburn
Shelburn RV Service
1727 Spring Place Road
Cleveland , Tn 

423 479-3627

1727 Spring Place Rd, Cleveland, Tennessee