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• Technology This invention is to fix the defects that have been occurred. This compensates for the defect when the geothermal heat pump device operates the air conditioning unit. Normally it reuses elevated temperature water in underground pipes which passes through a heat exchanger. However, the invention complements ground coupled heat pump system to minimize the pumping action to provide water. The resulting heat emitted is collected in heater tankers for re-use. Therefore, it efficiently utilizes residual heat and minimizes the number of pumps to operate Optimal Selection System in parallel. Technological application of unused energy 1. The temperature of the Water Supply Service in Seoul maintains 20’C when air conditioned. 2. The controlled temperature leads to an efficient way of heating water in the building.