Depends
Rick,The Cruisair works well on smaller boats (the smaller the better) I had a 7000 BTU model on my 35.5 and it wouldn't cool it, friend tried it on his Catalina 30 with same result. In addition they're heavy, and a pain to move on and off the boat when you want to sail. I ended up selling the unit and got one of the new portable apartment AC units that sits on the floor and is vented outside. My unit is a 10,000 BTU, paid $349.00 for it at Best Buy, a lot less than the hatch air units, it sits on the floor in front of the Vberth and I vented it out the forward hatch. I was concerned about it moving around when we heeled over but last week we were heeling 20-30 degrees and it didn't move. Last time I was at the boat when I got to the marina the inside temp on the boat was 98degrees below. Turned on the unit and within an hour it was down to 85, within 3 hours it was 74 with the temp outside hovering around 92. That night my wife slept under a blanket. If you've got the room below this is IMHO probably the best solution around, plus, and I haven't tried this yet, but I'm told one of the Honda 2000 generators will run it while on the hook.