There's a guy in my marina with a C25 like mine...he has one of those free standing units in his cabin. It takes up a fair amount of room but he has it back by the quarter berth, so it's not too intrusive. It's intake draws air from inside the boat, sort of a recirculation mode. He had to run a hose to the cabin wall in front of the cockpit, put a louvered vent cover over it outside, so the louvers open when the unit is running. Water exits to the bilge.
Works very well...it'll ice down that cabin in even our 100+ humid Texas heat. The only issue he had was the exhaust hose. He said it had to be as short as possible and as direct as possible for the unit to work right.
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1982 Catalina 25 #2897
Eagle Mountain Lake, Texas