Aside from Wayne's and Faster's concerns, it would seem to me that the heating/cooling of the boat would be adversely affected by doing it this way. The space between the hull and hull liner is likely to be hot in the summer and cold in the winter, and if you're not using a duct, much of your cooling/heating capacity will go towards cooling or warming the hull and space between the hull and hull-liner. Even an uninsulated duct will tend to help keep the cooling/heating air flow directed towards where it will do the most good.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.