Surface water has higher thermal conductivity and specific heat than ambient air. Therefore, surface-water source heat pumps have been extensively studied in recent years as substitutes for conventional air-source heat pumps. Surface-water source heat pumps can be operated by various surface water such as river water, seawater, or lake water as heat sources. However, there is a problem that the surface-water temperature can rapidly drop in winter, and there is a risk of freezing in the heat source side heat exchanger during the heating operation. Therefore, the concept of an air-assisted surface-water source heat pump is proposed as a solution to the freezing problem. Air-source heat pumps can operate under frosting conditions even at low ambient temperatures. In the hybrid system, heat is charged to the thermal energy storage by the assistive air source heat pump using late-night electricity, and the thermal energy storage is used as a heat source for the daytime heat-source compensation operation of the surface-water source heat pump. Energy analysis is conducted through dynamic simulation, and a comparison with a hybrid water source heat pump and an air source heat pump is conducted. As a result, it is confirmed that primary energy consumption can be saved 6.5 to 19.2% compared with the conventional systems.