The present invention cooling and heating and relates to a one-piece compact the supply device to supply the heat necessary for the hot water supply, and more particularly, the solar heat collecting apparatus and a geothermal heat pump device as one through the hot water storage tank integral with a buffer tank of the heat storage unit and combined heat the hot water storage tank to the solar heat collecting apparatus, by the temperature of the hot water storage tank is a geothermal heat pump device operation falls below the set temperature heats the hot water storage tank to a set temperature or higher, always hot water is supplied from the hot water storage tank, the cold , the cold required for the heating, can be heated is fed from the buffer tank, and thus is prevented from even a small load in the prior is that the geothermal heat pump device operation that this decrease in efficiency, and can respond immediately to a large moment load, as the one-piece by being formed of the first geothermal heat exchanger, geothermal heat exchanger in the interior of the hot water storage tank is built in order from the hot water storage tank and the buffer tank to the hot water supply and cooling and heating at the same time, built-in the second geothermal heat exchanger in the interior of the buffer tank, the cooling and heating the number and the hot water is not mixed and can maximize the regenerative capacity of the cooling and heating water and hot water heater, the storage capacity of the solar more especially because it has used the entire hot water storage tank the season (summer), there is no heating load this feature has turned to supply heat required for heating and hot water solar water heater can supply as much as possible to prevent overheating and day without solar radiation.