Water-source ground-source heat pump units can provide chilled water to the air conditioning units in summer. In winter, they should supply the central air conditioning with hot water sources or immediately provide cold air and warm air to the room. These units are commonly used in air-cooled units and small air conditioning units (such as window air conditioners, split air conditioners, and cabinet air conditioners, etc.). The inlets and outlets connected to the shell-and-tube heat exchangers serve as the central air conditioning chilled water source in summer and the central air conditioning hot water source in winter.