I just finished putting in air in my 37c. I used a marrine airrrr unit. 16,ooo btu. It will frost your cookies after it runs a while. At 95 degress and 90 percent humidity it took an hour or so to get it real comfortable and down to about 75 in a few hours. Im pretty happy with the deal.Put the unit in the aft cabin lower locker, Had to move the shelf down a few inches. then i ran the ac duct under the main panel out side of the the nav station. then out behind the port bunk then up thru a vent behind the sliding door above and behind the bunk. I just put a 45 degree vent there, it blows out and up across the celing in the main salon. Im waiting to see if i will put a duck forward or aft, but i dont think i will. The boats overall humidity goes way down and then ist ok pretty much everywere in the boat. I too would like to get it to run and a 2000e honda but we will see when i get around to it.Im a happy guy,Thanks to Ed S again for good advice on the install.