Many of these units have a single exhaust hose to spill out the hot air, but no intake hose. Not such a big deal in a large room with open doors in a house, but in a confined space like a boat it can be a problem. If your boat is well sealed you may get poor air intake/exhaust and inefficient cooling. If your boat is more leaky, you'll pull hot air in through all the leaks. Either of these scenarios leads to poor performance. A more proper design would have an air intake that goes through the cooling coils into the boat.
Check to see which design this air conditioner has.
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Formerly posted as "RhythmDoctor"
1998 Catalina 250WK Take Five (at Anchorage Marina, Essington, on the Delaware River)
1991 15' Trophy (Lake Wallenpaupack)
1985 14' Phantom (Lake Wallenpaupack)