AAC Commercial Rooftop Units (CRUs) are air conditioning systems designed for commercial buildings. They are typically mounted on the roof of the building and are used to provide air conditioning and ventilation for the entire building. The CRUs are designed to be energy efficient and provide the highest level of comfort for occupants. They are typically composed of several components, including a compressor, condenser, evaporator, and expansion valve. The compressor is responsible for compressing the refrigerant and transferring it to the condenser, where it is cooled and then sent to the evaporator. The evaporator is responsible for cooling the air and then sending it to the expansion valve, which regulates the pressure of the refrigerant. The CRUs are designed to be reliable and provide a long-term solution for air conditioning needs. They are also easy to maintain and can be serviced on a regular basis to ensure optimal performance.