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1. A flat white square with two wires coming out of it, that, when hooked up to [electricity], becomes hot on one side and cold on the other. Reversing the connections will swap the hot and cold sides. A solid-state heat pump. Found inside those iceless 12 volt coolers and on some overclocked computer chips. They are not usually used as a room [air conditioner] because they have a energy efficiency rating of less than 1, i.e. they generate more heat than they move. They have the advantages that there's no mechanical parts to break down, and no [environmental] issues with refrigerants such as the Freon used in a compressor, and they operate at 40dBa with fan instead of the 68 dBa of a commercial compressor with fan (read: much quieter) 2. A person's last name, so called because the first Peltiers used to collect pelts like fur trappers.
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