i would go look for a uses system, from a boat junk yard, as the new systems will run over $2,000.00
It will be under the V-birth, and you need to drill some holes in the boat, and a water pump and 110v electric.
So, the reality is, I have a/c on my 2800 scr and use the A/C two times to just pull out the humid.
So how offend do you need it?
If your inside the cabin, your not boating correctly.....