a/c installation costs
Assuming you have a location for the unit, typically under a seatee or maybe the v-berth forward, or maybe even by building a cabinet in part of a locker -- isn't hard and some reasonable cabinetry work can make it a slide-out unit for servicing depending on weight -- the hook-up is fairly straight forward; includes runnig wire from breaker panel to unit and hooking controller box to thermostat, raw water intake and outflow through an existing thru-hull or installation of same which can be a bit complicated. Assuming you are correct in using existing heating ducts for a/c use, most of the hook-up and install -- since most units are self contained -- can be done in a day with maybe another day for fine-tuning the installation. This assumes the installation remains a fairly straight-forward affair. At average shop rates of about $55/hr., x 16 hrs., you're looking at $800-$1,000 assuming the electric, inflow and outflow accessibilities permit use of existing facilities. If you can't piggyback on existing thru-hulls or if the runs from the existing thru-hulls make their use impractical, you can expect a haul-out, a day or two in the yard and the labor to install the requisite thru-hulls for inflow and outflow along with seacocks and an inflow strainer. Could maybe run as much as $1,500 in addition to previous guess. So, depending on your layout, my best guess is you're looking at $1,000 to $3,000. These prices are assuming you already have the unit. If not, add the cost of the unit to them. I would recommend you buy as much unit as you can; in your case, a 16,000btu unit with reverse cycle heat pump -- I like Mermaid units ALOT -- is a good idea. Of course, you can save some money by installing the unit yourself -- it's not that hard -- running the water lines, electrical lines, installing the controls in a handy spot and running the wiring to the unit yourself. It's not that hard to do, actually, and if you are the least bit handy and can read and follow directions, you're more than half-way there providing you have some tools and the time. I installed 3 MarineAir units in a Nautical 60 -- with help from the owner -- in a weekend and we'd never done that before and they all run fine. I installed a Mermaid unit in my Hunter 30 including the cabinet work in a weekend as well. The units are pretty much self-contained and the controls are typically prewired just requiring locating and hooking them up. If you are not familiar with your electrical panel, you might want to save that job for an electrician just to make sure you get it right. Hope this helps and good luck.