In an entirely closed and well heat insulated greenhouse (2) the major part of the floor is laid out as one or more water ponds (6), which are in heat exchange connection with the air of the house through a heat pump system, whereby day/night fluctuations of the air temperature are minimized. An active heating or cooling is effected according to the requirements, and the air is demoistured and cleaned as required. The water ponds (6), which are hereby kept warm all the year, are utilized as or in a fish fry farming system, and the plants are arranged in two layers (10,12). The fish ooze is usable as a fertilizer ingredient for the plants, while for the watering of the plants use is made of cleaned water from an internal cleaning system or from an air dehumidifying system.
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