An air-cooled chiller is a type of cooling system used to remove heat from a liquid, typically water, by transferring it to the air around the chiller unit. These chillers are commonly used in industrial and commercial settings for air conditioning, process cooling, and other applications where water-cooled systems are not practical or feasible. However, they can be less energy-efficient compared to water-cooled chillers, especially in hot climates where the ambient air temperature is high.