Why is that arear around the air cooler like back of the cooler and the sides hot when air cooler is switched on? Only where the air blows that place will be cool remaining places it will be hot. What is the reason and how to get around this? Especially considering that Air Cooler is cheaper option than Air Conditioner.
heat is generated in order to provide cool air. Consider your refrigeration unit. In order to make the interior cold heat has to be extracted. That's why the sides and cooling fins of your fridge get hot. Same thing with the air cooler.
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