A swamp cooler, also known as an evaporative cooler, is a device that cools air through the evaporation of water. It works by drawing warm air through water-saturated pads, which cools the air before it is circulated into a room. This method is energy-efficient and environmentally friendly, making it a popular choice in dry, arid climates. Swamp coolers are typically less expensive to operate than traditional air conditioning systems. They require a constant supply of water and work best in low-humidity areas, as high humidity can reduce their cooling effectiveness. Regular maintenance, such as cleaning the pads and checking water levels, is essential for optimal performance.