Depends on the fridge I would assume. Most small ones only use TEC's. While some more expensive one's actually use phase change. I imagine the phase change would work better as the TEC's are not really made to handle a heat load. Stuff you put in a fridge doesn't generate heat so it doesn't need extream power to cool things off. Take a mini fridge and put a 100watt hologen flood light in it and see if it can keep up. It will not. Put a bottle of Soda in there and it will keep it cool because the Soda doesn't create heat.
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