AC unit size for helm

You can get a 19,000, 120 unit from king-air.net. I have one in my boat and have installed two others all three working great. My first one lasted 25 years and had a fan problem I just replaced it with a new one.
 
We have 2 16,000 BTU units at the helm on our Tiara. This works great here in WI (a lot of times I can get away with running only 1 and except for 2 weeks in the summer its in heat mode). However I could see only 1 being under powered for a boat that is not fully enclosed and spends its time in the warm Florida climate.
 
All I can do is tell you mine works well, much better than the green heads eating you alive (it's a south jesey thing). My hardtop is insulated. The fans were the key, prior to them the unit was mainly used to warm the upper helm in the Spring and Fall. After installing the fans near the AC unit it keeps the humidity down, it is cooler with the unit running than with it off and I am very happy with it's performance. The units are fairly inexpensive and it has been going strong since I had the hardtop installed.
It is never ice cold or sauna hot (in the winter) but it sure takes more than the edge off the heat or cold depending on it's mode of operation.
I'm curious why 2 of these units with fans wouldn't work for you? Do you store your dingy up there?

Bill
 
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