Why does a desert cooler cool better on a hot dry day

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Why does a desert cooler cool better on a hot dry day? 

Answer - Desert cooler works on the basis of evaporation. In hot and dry days the moisture level is very low in atmosphere which increases the rate
of evaporation. 

Because of faster evaporation, cooler works well. That’s why desert cooler cool
better on a hot dry day.

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