>> The Halfords type and similar ones that appear in Aldi & Lidl at £30 or
>> so are cooled by Peltier effect. It's a semiconductor device that gets hot on one
>> side and cool on the other when switched on. The hot side releases heat via
>> a grille, sometimes aided a little fan blowing air over it to the outside of
>> the box, the other side cools the interior. The cooling effect is pretty small for
>> a reasonable current so the best way to use them is to fill them with
>> well refrigerated stuff and keep it cool, which it will do reasonably well.
Peltier devices are notoriously inefficient (unless things have changed recently), You're looking at the temperature drop across a semi-conductor bridge, that's atoms. Look very closely at the current consumption!
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