Chillers are a type of HVAC (Heating, Ventilation, and Air Conditioning) system that is used to cool air in large buildings and facilities. They are often used in industrial, commercial, and residential settings to provide a comfortable and safe environment. Chillers work by circulating a refrigerant, such as Freon, through a series of coils and pipes. The refrigerant absorbs heat from the air and transfers it to the coils, which are then cooled by a fan. The cooled air is then distributed throughout the building or facility. Chillers are a great way to keep a building cool and comfortable, and they are often used in conjunction with other HVAC systems to provide the most efficient cooling possible.