An evaporative cooler is a device that cools air through the

Solution

Relative humidity doubles with each 20 degree (Fahrenheit) decrease, or halves with each 20 degree increase in temperature. Generally, as temperature goes up, relative humidity goes down and vice versa. the lowest possible temperature to which moist air is around 20⁰C.

Evaporative cooling works by adding lots of moisture to the outside air and then pumping that air at high volume through your house. Generally, for the effect to be perceivable, the humidity in the outdoor air needs to be below 30% RH (Relative Humidity). RH is the amount of moisture that is in the air at a given temperature. As air gets warmer it can hold more moisture and conversely as it gets cooler it can’t hold nearly as much moisture. he relative humidity is the difference in the readings between two mercury filled glass thermometers. one that is exposed to the normal open air called the \'dry bulb\' and the other which is wrapped in a wet wick called the \'wet bulb\'.

In most places in norheast US, the humidity value is very high. which is not in the range of above mentioned.