Arne,,been thar done that,,,looked all over to find a small compac, light A/C that would work,,found a few that might could be adapted but the cost was way out there,,went back to the small window unit,,picked up a new complete unit 5200 btu from home depot,,it was end of the season and I got it for $40.00 bucks,,now I mounted it high in the center of the galley,,and believe it or not it works just dandy,,,right now I have it pulled out and I got a pass thru, place for a small heater,,coffee pot, etc,,I made a screen/plate to cover up the hole if I need it but so far I just leave it open,,
one idea I wish some a/c guru would come up with is to take a window unit,,seperate the outside works from the inside works,,bascially build a unit like what you have in a home,,compressor outside say on tongue and the inside unit built in in the rear cabinet area,,sort of a central a/c unit
it seems to me that if you could split the two components then it would be a matter of making the tubing longer and a little wiring
Living large,,,travling small !!!
Serro Scotty rebuild(in progress)