Originally Posted by Baker
I see those rooftop ACs on these boats often. Easy to install...if you have the nerve to cut through your roof. Significantly cheaper and they work really well.
I've heard that the ACE uses RV roof mounted type AC units as standard on their work boats.
The units are cheap (comparatively), designed to be mounted outside, is all in one, and can be run with the boat out of the water. The drawbacks are appearance, the need for a flat mounting surface, they are a bit noisier, and the external space they take up (e.g. can't carry a dinghy on the roof if you have an AC unit there).