PROBLEM TO BE SOLVED: To provide a heat exchange system having a relatively small occupied space, and excellent in thermal efficiency.SOLUTION: A heat exchange system 100 includes: heat storage tank 10 capable of storing liquid (hot water) as a heat exchange medium； a heat exchange tank 30 that is provided adjacently to the heat storage tank 10 with a wall body W1 having heat transfer property held therebetween to store hot water supplied from a hot water source H； a heat exchanger 50 arranged in the heat exchange tank 30； a liquid feeding route 70 that mixes liquid (hot water) heated by causing the liquid to fluidize from the lower part of the heat exchanger 50 to the upper part thereof with liquid (hot water) stored in the hot storage tank 10, and then feeds the mixture to a cultivation facility 200 as a heating object area； and a liquid returning route 90 that returns liquid (water) cooled by causing the liquid to pass trough the heating object area (cultivation facility 200) to the heat exchanger 50 and the heat storage tank 10.SELECTED DRAWING: Figure 1
