Air coolers, also known as evaporative coolers, are devices that lower air temperature through the evaporation of water. They work by drawing warm air through water-saturated pads, which cools the air before it is circulated into the room. This process is energy-efficient and environmentally friendly, making air coolers a popular choice in dry climates. Unlike traditional air conditioning systems, air coolers do not use refrigerants and are generally more affordable to operate. They are best suited for open spaces and well-ventilated areas, as they add humidity to the air. Regular maintenance, such as cleaning the water tank and pads, is essential for optimal performance.