AHU Refrigerator is a component of a Heating, Ventilation, and Air Conditioning (HVAC) system that is responsible for circulating and conditioning air within a building. It typically includes a fan, filters, dampers, heating and/or cooling coils, and sometimes humidifiers and dehumidifiers. The cooling function in an HVAC system is typically provided by a separate refrigeration system, which may include a chiller, a compressor, and refrigerant lines.