<；P>；PROBLEM TO BE SOLVED: To provide a device for heating a greenhouse utilizing two heating systems comprising a heat pump system and a fuel burning system, and subsidiarily utilizing a fuel burning-system heating device to reduce running costs and improve heating efficiency of the heat pump-system heating device at low temperature so as to effectively heat the greenhouse. <；P>；SOLUTION: The device for heating a greenhouse is provided with a heat pump-system first heating device 13 which can heat the inside of a greenhouse 1, and a burning-system second heating device 15. The device is structured so that at least part of the combustion gas of the second heating device 15 is supplied to an outer air intake of the first heating device 13 via a piping 27 when the outer air temperature gets below a prescribed temperature. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
