Several years ago, I made an AC unit using nothing more than a computer fan, a piece of paneling and a cooler chest. It worked very well, though a bit dampish after several hours of running.
I now run a heat pump with my Honda 2200i generator with a modified exhaust extension. The Honda 2200 is very, very quiet, runs the heat pump easily and I keep the cabin cooled down to 68 degrees at night. While the generator is running, with the hatches closed, I can barely hear it. It also runs the 21-inch smart TV and charges the batteries at the same time, and powers my portable oxygen generator. These little generators are absolutely amazing, however, Honda's tend to be far more expensive than the generators one can purchase at Harbor Freight, Lowes and Home Depot. But, the Honda is the quietest of them all and very reliable.
As for the boat itself, I have more than enough room for my wife and I on my Morgan 33 Out Island, which has loads of storage, a huge cockpit, quite easily sailed single handed, and it sails very comfortably because of it's extra wide beam and full keel. If the boat heels more than 5 degrees on a beam reach with 20 MPH winds, I begin to worry if there is something wrong. It's not a racing boat - it's a wonderful cruiser that makes life easy while living aboard.
Dave, it you folks didn't live so far away from here, I would let you take it out and explore Chesapeake Bay for a couple weeks. I'm not using the boat nearly as much as I used to because of my lung condition, which is growing worse by the day.
Good luck on your quest,