A HVAC chiller is a type of air conditioning system that is used to cool large buildings or areas. It works by circulating a refrigerant through a closed loop system, which is then used to absorb heat from the air and transfer it to a water source. The water is then cooled and circulated back into the building or area, providing a cooling effect. HVAC chillers are typically used in commercial and industrial applications, such as office buildings, factories, and warehouses. They are also used in some residential applications, such as in homes with central air conditioning systems. HVAC chillers are highly efficient and can save energy costs compared to other cooling systems. They are also relatively quiet and can be installed in a variety of locations.