The outdoor unit is an essential component of a split air conditioning system. It is the unit that is located outside of the building and is responsible for taking in air from the outside, cooling it, and then pumping it into the building. The outdoor unit contains the compressor, condenser, and fan, which are all necessary for the air conditioning system to function properly. The compressor compresses the refrigerant, which then passes through the condenser, where it is cooled and then sent to the indoor unit. The fan then blows the cooled air into the building. The outdoor unit is also responsible for releasing the heat from the building, which is then dissipated into the atmosphere. It is important to keep the outdoor unit clean and free of debris, as this can affect the efficiency of the system.