A regenerative air-conditioning apparatus is provided. The regenerative air-conditioning apparatus includes an outdoor unit including a compressor and an outdoor heat exchanger, an indoor unit provided on a side of the outdoor unit, the indoor unit including an indoor heat exchanger, a refrigerant tube that connects the outdoor unit to the indoor unit to guide circulation of a refrigerant, a heat accumulation bath provided on at least one side of the outdoor unit or the indoor unit to store cool air or heat, a first tube that extends from the refrigerant tube to one side of the heat accumulation bath, a second tube that extends from the other side of the heat accumulation bath to the refrigerant tube, and a third tube branched from the second tube, the third tube being connected to the refrigerant tube.