By passing outdoor air over water-saturated pads, the water in the pads evaporates, reducing the air temperature by 15° to 40°F before it is directed into the home. Evaporative coolers, also known as swamp coolers, use this principle. It's the same principle behind why a wet towel on your forehead feels cool, scaled up with fans, water pumps, and specially designed pads to cool an entire. In the realm of residential cooling solutions, evaporative coolers, often referred to as swamp coolers, present a compelling alternative to traditional air conditioning systems. These devices leverage the natural process of evaporation to lower air temperature, offering an energy-efficient and. Water evaporates at room temperature because of the Maxwell-Boltzmann distribution of molecular energies—even at low average temperatures, some surface molecules have enough energy to escape into the air. Factors like humidity, wind, and surface area affect the rate of evaporation.