Air-cooled chillers are cooling systems that use air to remove heat from a building or process. They work by circulating refrigerant through a series of coils, where air is blown over the coils to absorb heat. This process cools the refrigerant, which is then used to lower the temperature of water or other fluids. These chillers are commonly used in commercial and industrial applications, such as in air conditioning systems or food processing. They are often preferred for their lower installation costs and reduced need for water compared to water-cooled chillers.