Abstract—The article presents the results of the numerical estimation of the influence of temperature potential of the geothermal heat energy extracted from the soil with the use of GHSP and borehole heat exchangers depth on the efficiency of the GSHP systems in Moscow and Moscow region geo-climatic conditions.  The paper provides the assessment of natural temperature potential of geothermal energy in Moscow region and proposes “typical climatic years” referencing the natural change of average decade and monthly ground temperatures for Moscow geo-climatic conditions. The authors found that consumption of ground thermal energy in specific ground conditions of Moscow region generally results in decreasement of temperature potential of the extracted heat by 5-6 degrees by the 10th year of operation and by the 15th year the process is stabilized.  The studies in the paper allow establishing that the borehole heat exchanger GSHP efficient depth for Moscow and Moscow region geo-climatic conditions is close to 60 meters. In this case the temperature potential of the geothermal heat energy extracted during many years of GSHP usage can be expected at the level of 5-10 degrees below Celsius.  
 
Index Terms—Ground source heat pump (GHSP), borehole heat exchanger, ground temperature, typical climatic year, geo-climatic conditions, thermal efficiency