Evaporative coolers, also known as swamp coolers, are devices that cool air through the evaporation of water. They work by drawing warm air through water-saturated pads, where the air loses heat as the water evaporates. This process results in cooler, more humid air being circulated into the environment, making it an energy-efficient cooling option, especially in dry climates. These coolers are typically less expensive to operate than traditional air conditioning systems. They require a constant supply of water and are best suited for areas with low humidity, as high humidity can reduce their effectiveness. Regular maintenance, such as cleaning the pads and ensuring proper water flow, is essential for optimal performance.