Estimating Air Conditioning BTU Requirements

I made a rough estimate of ECHO's volume excluding the collision bulkhead spaces.

2000 cubic feet is perhaps a little on the high side, and I am OK with that given that my deck is flush and seems to absorb a lot of heat in direct sunlight. 

14 times is a multiplier for cubic volume to estimate the BTU cooling needs of a boat.  With this estimate ECHO needs 28,000 BTU's of cooling. 

So now the question is how do I accomplish this?

One 28,000 BTU or greater air conditioner with ducting could accomplish this economically but require a more complex control system.

Another option would be to use a number of air conditioners.  This would cost more but allow me to start with one small air conditioner suitable for one cabin and add more later.  It avoids running ductwork and a complicated control system.  I would occupy more space.

Space limitations may dictate the option I choose. 

I

Air Conditioning

It seems rigging those tarps was a smart move and today I stopped in a Home Depot and saw a pallet of air conditioners. I grabbed a 10,500 BTU into and used the box, a garbage bag and some shrink wrap tape for ducting. Temps dropped 2 degrees on a short time so I decided to take a break and hydrate. 

This is in addition to the 5,000 BTU already installed that was ineffective alone.

I also moved my power feed to a different pole to shorten the power run.