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There is a used carry-on sitting in our marina with a $315. price tag. Figure about $1500. for an installed unit like my 12K Mermaid. I also have a Cherubini but it is ten feet longer. Finding a place for it can be a problem on an H27. It is almost exactly the size of a standard carton with one inch cut from the height(see Related Link for exact dimensions). You can cut down a box and use it for a template. Given your interior volume you might get by with a 9K.Mine sits in a cabinet in the quarterberth and blows into the salon under the nav table. I ran no duct work. I T'd off the engine water so only had to drill one hole for the water outlet, right through the middle of the bootstripe.Yesterday it was 85 degrees and the humidity was the same. It would have been ninety in here. But it was 72 in the salon and v-berth, and dry. Four summers now, really adds to the enjoyment of the boat.