<；P>；PROBLEM TO BE SOLVED: To provide an inexpensive greenhouse heating system capable of being miniaturized. <；P>；SOLUTION: This greenhouse heating system has a heating apparatus 4 for heating air, and a hot water heating means 6 for heating air using hot water. The heating apparatus 4 has a burning burner 16 which generates heat, and a first heat exchanger 20 for performing heat exchange between a heat conveying medium heated by heat generated with the burning burner, and air. The hot water heating means 6 has a second heat exchanger 42 for performing heat exchange between hot water and air. Air which is inhaled from an air intake side of the first heat exchanger 20 is heat-exchanged with the first heat exchanger and discharged from an exhaust side thereof, and air which is inhaled from an air intake side of the second heat exchanger 42 is heat-exchanged with the second heat exchanger 42 and discharged from an exhaust side thereof. The second heat exchanger 42 is arranged on the air intake side or exhaust side of the first exchanger 20. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
