Heater / cooler

I don't have any experience of it, but it's 2 kw and the advert does say it is fitted with a 13 amp plug, so I can't see it being much use on a small boat, apart from maybe in a marina while connected to shore power.
 
I cant say for that one but a number of these types of units act as a cooler by spraying a fine water mist in front of the fan which when it evaporates chills the air coming out. They work well enough but do raise the humidity and I'd be concerned about black mould appearing.
 
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