When cooling or heating is implemented, the thermoelectric module generates heat or cools on the opposite side of use according to the law of conservation of energy. In this case, the air-cooling method removes heat with a radiator + cooling fan, but the lowest temperature reached is less than that of the water-cooling method, and the cooling speed also decreases slowly because the heat of the air is not large. Accordingly, by supplying various solutions that do not have problems with water or electric short circuits, it is possible to realize faster cooling speed and lower temperature by recovering the heat of the thermoelectric element.