Simulation is performed to predict the annual electrical and thermal behavior of two HP-PV/T systems (systems with and without auxiliary heating equipment) used in three typical climate areas of China, namely Hong Kong (114.17E, 22.32N), Lhasa (91.13E,29.67N), and Beijing (116.28E, 39.93N). Hong Kong stands south of China where the available solar radiation is low and represents the area with hot summers and mild winters. Lhasa stands west of China, where the available solar radiation is highest, and represents the area with mild summers and cold winters. Beijing stands north of China, where the available solar radiation is higher, representing the area with hot summers and cold winters. The average ambient temperatures in daytime and the average solar irradiations of the three areas are shown in Fig. 7. The weather data of the three reas are provided by EnergyPlus [33]. The weather types are City-UHK for Hong Kong and CSWD for Lhasa and Beijing. The weather of Lhasa and Beijing is cold in winter, so ammonia–aluminum heat pipes were used in the HP-PV/T system to avoid freezing. However,in Hong Kong, the weather is mild in winter and water is not