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Geothermal heat pump (GHP) systems have become an efficient alternative to conventional cooling and heating methods due to their higher energy using efficiency. These systems use the ground as a heat source in heating mode operation and a heat sink in cooling mode operation. The aim of this study is to evaluate the heating performance of the GHP system for a residential building (420 m 2 ) in Ulaanbaatar, Mongolia. In order to demonstrate the feasibility of a sustainable performance of this system, we installed the water-to-water geothermal heat pump with ten vertical ground heat exchangers and measured operation parameters from October 19, 2013 to March 26, 2014. The results showed that the entering source temperature of brine from the ground heat exchangers was in a range of the design target temperature of -10℃ for heating. For total values of the representative results, the ground heat exchangers extracted heat of 53.51 MWh from the ground. In addition, the GHP system supplied heat of 83.55 MWh to the building and consumed power of 30.27 MWh. Consequently, the average heating seasonal performance factor (SPFh) of the overall system was evaluated to be 2.76 during the measurement period of the heating season. Key words지열 히트펌프(geothermal heat pump) 시스템은 크게 지중열교환기(ground heat exchanger, GHE)와 지열 히 트펌프로 구성된 냉난방 시스템이다. 기존 설비에 비 해 냉난방 에너지를 크게 줄일 수 있는 대안으로 최근 들어 많은 관심을 받고 있다.(1) 아울러 공기 열원 히트 펌프와 비교했을 때, 연중 냉난방 성능이 우수한 것으 로 알려져 있다. 이는 히트펌프의 열원(heat source)과 히트싱크(heat sink)로 활용되는 지중이 연중 거의 일정

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