The greenhouse is simple in construction, of high heat absorbing efficiency and capable of much absorbing and accumulation of heat. A heat accumulating chamber partitioned by transparent sheets is provided between the roof and a floor surface facing north in the greenhouse. A blower fan is disposed to face an opening provided at the lower portion in the heat accumulating chamber. In the heat accumulating chamber, a heat accumulating unit having a large number of light transmitting windows and enclosing a phase transformation heat accumulating material is detachably suspended in a position close to windowpanes at the north side.
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