PROBLEM TO BE SOLVED: To provide a hydroponics device intended for performing cooling and heating in the hydroponics device at a low electricity cost. SOLUTION: This hydroponics device 1 is set with a heat storage tank 6, and a heating medium 5 of the heat storage tank 6 can be cooled or heated with a heating medium temperature adjusting device 7. It is possible to make an electricity cost low in the case of performing operation of the heating medium temperature adjusting device 7 by night electric power, and performing cooling in the daytime during a summer season and heating in the daybreak during a winter season using the heat storage tank 6. In the hydroponics device 1 shown in figure, the heat storage tank 6 is arranged so as to be adjacent to a cultivation tank 4 for cultivating plants 3, so it is possible to reduce heat loss when cooling or heating the plants 3, and increase air-conditioning efficiency. Furthermore, the heat storage tank 6 hardly becomes obstructive when taking care of the plants 3 because the heat storage tank 6 is arranged so as to hide in the lower side of the cultivation tank 4. COPYRIGHT: (C)2009,JPO&INPIT
