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> I would expect waterbeds to be easier to regulate as well, as I imagine they have a higher thermal conductivity. This could allow to place the cooling apparatus underneath, and make it something like a regular fridge radiator.

I dunno if you've ever slept on a waterbed, but you probably would not want to have a cooling system. The large heat capacity of water means that they act like a giant heat sink, they're actually pretty cold as is. It's the same reason a pool full of water at room temperature feels cold when you jump in.




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