PROBLEM TO BE SOLVED: To provide carbon dioxide supply devices which comprises a storage tank for a heat medium and can keep the temperature of a heat medium stored in the storage tank sufficiently low and can thereby suppress the increase of the temperature in a house using the heat medium for a long period of time.SOLUTION: A carbon dioxide supply device 100 comprises a burner 110 which burns fuel； a circulation flow path 170 which is a single or a plurality of flow paths through which a heat medium circulates, and a part of which is heated by combustion gas； a pump 140 for circulating the heating medium； a storage tank 120 which is a container provided in the middle of the circulation flow path 170 and which stores the heating medium temporarily； an internal heat exchanger 150 which performs heat exchange between the heat medium circulating in the circulation flow path 170 and the air inside a house 10； and an external heat exchanger 130 that cools the heat medium circulating in the circulation flow path 170 to reduce the temperature of the heat medium.SELECTED DRAWING: Figure 1【課題】貯留タンクに貯えられた熱媒体の温度を十分に低くしておくことができ、これにより当該熱媒体を利用したハウス内の温度上昇抑制を長時間に亘り行うことのできる二酸化炭素供給装置を提供する。【解決手段】二酸化炭素供給装置１００は、燃料を燃焼させる燃焼器１１０と、熱媒体が循環する単一又は複数の流路であってその一部が燃焼ガスによって加熱される循環流路１７０と、熱媒体を循環させるポンプ１４０と、循環流路１７０の途中に設けられた容器であって熱媒体を一時的に貯える貯留タンク１２０と、循環流路１７０を循環する熱媒体とハウス１０の内部の空気との熱交換を行う内部熱交換器１５０と、循環流路１７０を循環する熱媒体を冷却しその温度を低下させる外部熱交換器１３０と、を備える。【選択図】図１
