Abstract: A container material sealing and containing a latent heat storage material is arranged in a ceiling blow chamber box. Then, an air conditioning system of radiation type in which the metal panel is cooled or warmed by using as an auxiliary heat source the latent heat storage material having been cooled or warmed by heat storage achieved by cooling or warming the latent heat storage material with cool or warm air generated by a heat pump air-conditioner and then coolness or warmth is radiated from the metal panel into a room and an air conditioning system of convection type in which cool or warm air generated by the heat pump air-conditioner is blown into the room are provided and then the two air conditioning systems are used simultaneously or alternatively any one alone of the air conditioning systems is used so that air conditioning of the room is performed.