The aircon unit will be expensive but if you already have heating ducting then this can be used so installation should not be more than a mornings work at local rates.
Depends on spec. Also I think pcuk underestimates with his "morning's labour". The boat has to be craned out to drill the skin fittings and install seacocks, so you have the crane costs (unless the boat is already out of the water?)
Assuming you want the whole boat airconned to high standard with separate airhandlers and compressors, it would be about £8,000 / €12,000 for good marineAir or similar kit. And you wouldn't use the existing ducting much
But if you want a partial job it would be cheaper. Eg €2500 for one smallish combined compressor/airhandler unit connected to existing ducting, plus the crane charges.. Advise spec you want maybe?
Existing duct outlets s are probably at floor level - not good for airco
You need as generator to run airco at sea becuase it is invariably 230v
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The aircon unit will be expensive but if you already have heating ducting then this can be used so installation should not be more than a mornings work at local rates.
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Using heating ducting is not adviced since you will get masses of condensation. If you look at boat air con ducting it has a really think insulation to prevent this. Also ducting needs to come out as high as you can get it and not at floor level as is usual with heating. I DIY'ed my S37 and the bits were £2000 including one 9k BTU unit which I find adequate in the N.Med A full spec would be two units totalling 14k BTU's