As we know fridge can't cool room in which it is (according to Second Law of Thermodynamics, heat emitted by fridge is greater than heat absorped).
However, when we go next to the fridge in supermarket we can feel coldness. Why?
The cool air you feel near a supermarket fridge is due to imperfect insulation — or someone just opened the door :-)
Though it is true that a fridge can't cool a sealed room that it is completely in, just like air-conditioning, the heat is pumped via coolant to a radiator to be dissipated reasonably far away from the fridge so as to not heat up the surroundings of the fridge.
In other words, there is net heat loss in the vicinity of the fridge, but not in the whole universe!
The idea here is like in cooling towers in Australia. But what makes the difference? Heat Exchangers.
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