PROBLEM TO BE SOLVED: To provide a culture space having a humidity suitable for plants without being affected by the fact that the calorific value to a given photon flux density differs depending on the type of lighting equipment.SOLUTION: An air-conditioning apparatus (20) performs air-conditioning in a plant cultivation room (S). At least two kinds of lighting equipment (40, 50) are arranged at the cultivation room (S), and the calorific value to a given photon flux density differs from each other. A determination part (61) determines the installation ratio of at least two kinds of lighting equipment (40, 50) so that the load ratio indicating the ratio of the sensible heat load in the cultivation room (S) to the total heat load in the cultivation room (S) is about the same as the sensible heat ratio of the air conditioning apparatus (20).SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】所定の光量子束密度に対する発熱量が照明機器の種類によって異なるといった影響を受けることなく、植物にとって適正な湿度の栽培空間を提供する。【解決手段】空気調和装置(20)は、植物の栽培室(S)内の空調を行う。少なくとも2種類の照明機器(40,50)は、栽培室(S)に配置され、所定の光量子束密度に対する発熱量が互いに異なっている。決定部(61)は、栽培室(S)内の全熱負荷に対する栽培室(S)内の顕熱負荷の割合を示す負荷比率が、空気調和装置(20)の顕熱比と同程度となるように、少なくとも2種類の照明機器(40,50)の設置割合を決定する。【選択図】図1