Dehumidifying is part of what first got me thinking about Peltier junctions, mostly because they are really small and no moving parts, in theory the cold side should condense water out of the air, or you could have the cold side hooked up to your plug in hot water tank, then instead of pulling heat out of your hot water tank until it was close to cabin temp you could pull heat out of it until it was cold, after all you would have to add energy to a oil filled radiator or water storage tank to get it from ambient temp up above cabin temp and unless you have a way to pull that energy out of your heat storage it will be wasted.
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