GEOTHERMAL HEAT UTILIZATION APPARATUS

PROBLEM TO BE SOLVED: To provide a geothermal heat utilization apparatus that can more effectively utilize geothermal heat.SOLUTION: The geothermal heat utilization apparatus of a building 1 includes: an air conditioner 12 which includes indoor unit 13 installed in the building 1 to exchange heat with air of the indoor side 9 of the building, an outdoor unit 17 for exchanging heat with air captured from an external air capturing port 21, and a path 18 of heat conveyance fluids circulated through the indoor unit 13 and the outdoor unit 17; and an air supply port and an exhaust port. A part of a ventilation path 2 where a suction port 2a is communicated with external air is buried in the ground, the ventilation path 2 is branched, one blow-out port 2A on the downstream side of a branch point is connected to the external air capturing port 21 of the outdoor unit 17, the other blow-out port 2B is connected to the air supply port 11A of the building 1, and switching means 3 of an air flow path is installed at the branch point of the ventilation pipe 2 to switch the supply destination of air conditioned by geothermal heat to the outdoor unit 13 or the inside of the building 1.