Join Date: Oct 2007
Location: Washington, DC
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Re: carry-on/portable air conditioning units
We also have been using one of those floor units for a couple of years, although we are currently in the process of installing a marine, water cooled unit. The floor unit was adequate, but it has a significant downside that neither the marine nor window units have - that is that the unit pulls air from the cabin to carry away the hot air. This means that it creates a negative air pressure, which will cause outside hot/humid air to come into the boat, which decreases efficiency. That and the fact that it takes up space is why we are making the switch. All that said, I think the downsides are made up by the fact that you don't need to carry it up to the deck and back inside like the CruiseAir units, and you don't have it blocking the companionway like the window units. As to your last question, it depends on the diameter of the cowl vent. I think our unit has a five inch diameter vent line. We actually vent ours out through one of our smaller port windows - we just remove the screen, squeeze down the vent a little to make it fit, then use a small piece of insulation to block the area around the vent. It is simple and given that the heat will be here in a matter of days, I'd pick one up now if that is the way you want to go. If you use it for a few years, you will likely get most of your money back if you selll it on CraigsList in the summer when they are sold out at the stores.