the drying room and operation system cost about 11,000 USD and the payback period at around 15 months is found. From the testing data of the central drying room, it could be seen that if moderate potential hot springs as shown Table 8 are used in the drying process, the total heating capacity at around 406 kW could be used for extracting moisture of the agricultural products. Drying process by vapor compression heat pump The drying room integrating with the heat pump system is constructed giving an intake capacity of about 3 Ton (3,000 kg) of agricultural products. It generates the air room temperatures between 60-75°C. From the testing results as shown in Table 9, it could be seen that efficiency test of the empty drying room showed that the room temperature increased from 25°C to be 70°C within 3 hours. The energy efficiency ratios (EERs) of the VCHP and the drying room