AC, our solution...
We own a H-34 and didn't want to spend the money for built -in 12,000 btu AC right now, so here is something that works for us.We knew the CruiseAir was only about 4,000 btus, and of course more is always better, so we found a portable window unit made by White Westinghouse rated a 7,000 btus, all white plastic with a handle built in and only weighs 50 lbs. (price about $350)I built a small wooden platform to fit the bottom of the unit and attached 4 small swivel rubber wheels and strapped the AC to it with a battery box strap.We use it on the main hatch, (the AC on the platform rolls back and forth on the cockpit floor) and had a insulated canvas flap cover made to fit . To enter or exit the boat , we simply lift the canvas flap , roll the AC back about a foot and step out (or in).We have found that 7,000 btus works great for sleeping at night , but is a little weak for the heat of the day and takes a couple of hours to cool down the boat. We usually plug in and then go for a swim and return to a much cooler boat. (Another trick we use is to close off the fore & aft cabins until the main cabin is cool the open the doors and cool the cabins with fans blowing the cool air into them.)Like I say this works for us, 7.000 btus should work even better on your 30 footer but to live aboard I would go for the 12,000 built in unit. Good Luck, and stay coolCharles & Lynn Duhons/v "Artistry"www.ArtistryMarineArt.com