To provide a low-temperature warehouse using geothermal heat and capable of restricting the generation of mold in a foundation and a floor surface and capable of leading air cooled or heated by the geothermal heat and maintained clean into a warehouse at low facility cost.

In this low-temperature warehouse using geothermal heat, the foundation 1 and a floor 2 are structured of concrete, in which granular bamboo charcoal and wood charcoal are mixed. Ground inside a warehouse H or outside ground adjacent to the warehouse H is excavated to a depth D wherein ground water 3 springs, and an excavation hole 4 is provided, and pipes 7 respectively provided with multiple holes 5 in a side wall surface thereof are stood in the excavation hole 4 with a clearance, and an inverted T-type large pipe 8 provided with multiple holes 5 in a side wall thereof is arranged in a central part of an upper ends of a group of the pipes 7. A mixed material layer A is provided in the clearance between the excavation hole 4 and the pipes 7 to a position higher than level of the ground water 3, and an air cleaning member layer B is provided in the clearance between the excavation hole 4, the pipes 7 and the large pipe 8 except the mixed material layer A. An air pump 9 is provided in the large pipe 8, and a discharge pipe 10 of the air pump 9 is led into the warehouse H.