The unit is King-Air Marine Air Conditioner ( http://www.king-air.net ). From what I can tell, the it was purchased in 1995 and cost $2,000. The previous owners had it professionally installed into the boat, which probably cost them another $1,000. This unit probably weighs 75lbs. That is 75lbs we could be using for more important things, like food.
So if anyone needs a marine water cooled air conditioner really cheap, write us via comment to this post.