The article is devoted to temperature changes in the ground massif with the horizontal heat exchanger as an energy source for a heat pump. The article was aimed at analyzing temperature changes in the ground massif with the horizontal heat exchanger at the beginning, in the course of and at the end of the heating sea-son. Another aim was to analyze temperature differences in the area of the horizon-tal exchanger and the reference lot. The heat flow utilized in the evaporator of heat pump was extracted from the ground exchanger (nominal output at the condenser was 10.5 kW). Temperatures of the ground massif with the horizontal heat ex-changer were measured in its plane in depths of 0.75 m, 0.5 m and 0.25 m. The temperature inside the ground massif on the reference lot and ambient parameters were measured as well. It is obvious that the difference of energetic potentials in-side the ground massif with the heat exchanger and on the reference lot is insig-nificant at the beginning of the heating season. During the heating season, the dif-ference of ground massif energetic potentials increases; at the end it is constant. The difference of temperatures in horizontal planes was not significant at ...
