Been kicking around the idea of installing a self contained AC unit to cool the back deck area of our 53MY, making the deck an "extension" of the salon in warm weather so we would leave the salon doors open. We have an unused (currently capped) seacock in the aft bilge area that could provide cooling water. I'm thinking somewhere around 6-7k BTU would be sufficient.

Anyone done this and have any thoughts/advice?