To effectively perform cooling/heating, snow melting or the like by supplying hot heat or cold heat obtained from natural energy to a building or a pavement layer of a road or a runway.

Heat exchange pipe groups 81 and 91 are disposed on soil layers 85 and 95, the clearances thereof are filled up with soils 82 and 92, heat insulating foamed styrol boards 83 and 93 are placed on the pipe groups 81 and 81, and mat foundations 84 and 94 are disposed thereon to thereby heat accumulation units 80 and 90. A building 61 with indoor heating and cooling equipment 65 is disposed on the mat foundations. A surface heat collecting pipe groups 70 disposed along another ground surface 72 is connected with the heat exchange pipe groups 81 and 91 by an antifreeze circulation path through a controller 71. In summer or winter, high-temperature or low-temperature energy stored in the soil layers 85 and 95 just below the heat exchange pipe groups 81 and 91 is released from the indoor cooling and heating equipment 65.