An evaporative cooler, also known as a swamp cooler, is a device that cools air through the evaporation of water. It works 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 living space, making it an energy-efficient alternative to traditional air conditioning systems. Evaporative coolers are most effective in dry, arid climates, where the humidity is low. They are typically less expensive to operate and maintain than conventional air conditioning units, making them a popular choice for homeowners looking to reduce energy costs while staying comfortable during hot weather.