NOVELTY - The system has an underfloor thermal radiation box (3), provided beneath the first floor of the building, defined by a thermal storage layer (20). An underground side heat insulating material (1) embedded up to 3 meters or more is added with water impermeability and connected to the outer wall heat insulating material (23) of the building. The blower outlet (A) of a solar heat circulation duct (13) is located within the thermal radiation box and closer to the thermal storage layer than the blower outlet (B) of the circulation duct (10).    USE - Air conditioning system using geothermal heat and solar heat for building. Uses include but are not limited to a vegetable factory, timber house, common house, fixed temperature storage, agricultural greenhouse, school, gymnasium, theater, public hall, meeting place, apartment, office, public building and existing building.    ADVANTAGE - By providing the underfloor thermal radiation box, air conditioning during summer as well as combined solar and geothermal heating can be efficiently performed with sufficient user comfort. Stable geothermal heating can be ensured since the thermal radiation box is enclosed by the heat insulation wall and since such heating is not easily influenced by underground water or rainwater. Room heating efficiency is improved by increasing heat release of the underfloor thermal radiation box with minimal influence of external temperature. Geothermal heat and solar heat can be stored efficiently by providing thermal storage material in combination with concrete inside the thermal radiation box. Good construction precision can be ensured since the underground side heat insulating material is construction from a sheet pile mounted with insulation board and embedded into the perimeter of the thermal insulation box by auger construction method. Solar heat added to geothermal heat can also be used in snow melting on roof or eaves edge.    DETAILED DESCRIPTION - The system has an underfloor thermal radiation box (3), provided beneath the first floor of the building, defined by a thermal storage layer (20). An underground side heat insulating material (1) embedded up to 3 meters or more is added with water impermeability and connected to the outer wall heat insulating material (23) of the building. A circulation duct (10) is connected to the rooms in the building via blowing suction inlets (12). The blower outlet (A) of a solar heat circulation duct (13) is located within the thermal radiation box and closer to the thermal storage layer than the blower outlet (B) of the circulation duct. The solar heat circulation duct connects with an under-roof duct (14).    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of an air conditioning system. (Drawing includes non-English language text).    Underground side heat insulating material (1)    Underfloor thermal radiation box (3)    Circulation duct (10)    Blowing suction inlets (12)    Solar heat circulation duct (13)    Under-roof duct (14)    Thermal storage layer (20)    Outer wall heat insulating material (23)    Blower outlets (A,B)