I live aboard year-round with cold winters and hot summers, so power bills are a consideration.

I currently have an R22 Crusair split system with seven 35-year-old air handlers and 5 condensers relaced in the late '90s, served by a large seawater pump and manifold/relay.  The system works great when fully charged, but the salon and master stateroom units lose their charge in 1-2 months.  I'm tired of limping along with $250 service calls to charge these units.

Thanks to Steve, I now understand the chilled water systems are too expensive. 

It doesn't make sense to me to replace leaking air handlers right now with old R22/417 technology, and run the risk or probability of new leaks or other problems in the lines or condenser.  Replacing air handlers and condensers with the new more efficient Emerald 410a split system is not a diy project for me which makes it very expensive.

This caused me to look at replacing the leaking units one at a time with self contained units.  I could do this myself to save a small fortune.  But that would leave only three small condensers in the engine room with a large high-amp seawater pump, until they need replacement.  One of the staterooms will be very difficult to serve with a self contained unit.  And there is something nagging at me about converting a classic old motoryacht to smaller boat technology. 

It is surprising how little price difference there is between small and large self contained units.  With a little duct work, …

Hmmm, duct work.  What if the whole boat could be ducted with a high pressure air handler, or perhaps one for the upper level and another for the lower level.  Something like this:

http://1source2buy.com/spacepak.htm

Any ideas?14

What is the difference (besides price) between the Stowaway units and these:

http://marine-ac.com/marketpla…..ditioners/

David…Links below for your review:

MarinAire installation & control operation:

http://marinaire.com/v/marinai…..manual.pdf

Dometic Turbo (Marine Air version) 

http://www.dometic.com/FileOrg…..nstall.pdf 

Dometic Marine Airrr Passport I/O control operation:

http://www.dometic.com/FileOrg…..rt-I-O.pdf 

Dometic Cruisair SMXir (Remote Control Available) operation:

http://www.dometic.com/FileOrg…..ration.pdf 

Questions as always I'm happy to try to answer  

Steve~