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I was thinking about that dissimilar wire that the 12 volt coolers work on, I don't remember the wire materials involved, but if you go from say Copper(?) wire to iron(?) wire, than at a later point go back to Copper and connect both ends of the copper to 12v dc one of the connections will give off heat the other absorbs heat, simply changing the direction of flow switches which one is hot or cold. I can't remember the technical name for it but I think 30F colder than current temp is all it will do.
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