To effectively and efficiently warm or cool the interior of a building by warming or cooling the underfloor space over a wide range by effectively convecting and circulating the warm and cold air to a corner where it is difficult for the underfloor space to be warm or hard to cool Provide an integrated energy saving building heating / cooling system by air circulation technology.SOLUTION: The floor space 2 and the underfloor space 3 communicate with each other through an opening 4, and by supplying hot and cold air to the underfloor space 3, hot and cold air is blown out from the opening 4 and the floor space 2 A warming / cooling air blowing means 6 for blowing warm / cool air to the underfloor space 3, a warm / cool air blowing means 6 disposed in the underfloor space 3 and warming or cooling the warming / cooling air blown by the hot / cold air blowing means 6 And an airflow adjusting plate 7 for convecting the airflow in the underfloor space 3.
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