You'll get decent temps but you'll right in that you'll get condensation. Right up until the point when the fridge overheats and dies. The problem is fridges are meant to keep cold stuff cold, not cool off hot stuff. IT will end up running almost 100% of the time just to keep up, then poof it will die...
Even worse if it dies while your at work the fridge will end up being a heater by not letting the now hot air out. So the air inside will get hotter and hotter and hotter etc...
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