With the middle of summer fast approaching and a spouse and pet who are less than enthusiastic about the sweltering heat, I am considering purchasing a portable air conditioner for occasional use on hotter weekends at the dock. This is for a Cal 28 and I don't really want the weight or complexity of a permanent installation. I have tried using a relatively cheap, generic, 5000 BTU unit in the forward hatch with mediocre results. Searching around for portable a/c units designed for boats (i.e. expensive) I find the Cruisair Carry-On and the AquaCal Krusin Kool units as the major contenders (both nominally 7000 BTU units). I am especially interested in the AquaCal because it stays inside the boat while running and because it is water-cooled which seems like it should be more efficient.Does anyone here have experience with the Krusin Kool? Comments on the Cruisair would be appreciated as well.Thanks in advance,Larry