A chiller unit HVAC is a type of cooling system that is used to cool air or liquids in a variety of settings. It is an integral part of many commercial and industrial applications, such as air conditioning, refrigeration, and cooling of process fluids. The chiller unit is typically composed of a compressor, condenser, evaporator, and expansion valve. The compressor is responsible for compressing the refrigerant gas and transferring it to the condenser, where it is cooled and condensed into a liquid. The liquid is then passed through the evaporator, where it absorbs heat from the air or liquid that is being cooled. Finally, the liquid is passed through the expansion valve, where it is reduced in pressure and converted back to a gas, ready to be recycled back to the compressor. Chiller units are an efficient and cost-effective way to cool large areas, and are used in a variety of settings, from commercial and industrial buildings to medical facilities and laboratories.