PROBLEM TO BE SOLVED: To provide a cultivation space airconditioning system capable of decreasing an air temperature in a cultivation space, becoming an excessively high temperature, without increasing energy consumption and an occupied space of an air conditioner.SOLUTION: This cultivation space airconditioning system 100 performing airconditioning for air in a cultivation space to cultivate plants P includes an air conditioner 1 performing cooling processing to supply cooled air to the cultivation space, a circulation air supply means 12 to supply air in the cultivation space to the air conditioner 1, an open air supply means 13 for supplying air outside the cultivation space to the air conditioner 1, a cultivation space inner temperature sensor 15, and a control means 19 which controls the air conditioner 1 so as to perform cooling processing when a temperature detected with the cultivation space inner temperature sensor 15 is higher than a prescribed target temperature, and controls the open air supply means 13 so as to supply air outside the cultivation space to the air conditioner 1 when a temperature detected with the cultivation space inner temperature sensor 15 is higher than a prescribed limit temperature higher than a target temperature.
