I believe all of you who say an underpowered peltier will make it hotter are dead wrong. Your assertion that a 50W peltier (for example) can only move 50W of heat is first of all wrong. That the is the amount of energy it draws -- and therefore adds -- to the system. Your theory that it couldn't move enough heat if it were underpowerred would hold up, on the assumption that the peltier was a perfect insulator on its own, which it definitively is not.
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