Why doesn't Juye primary school turn on the air conditioner when it's so hot?

It's so hot in Juye, why doesn't the primary school turn on the air conditioner? Maybe the teacher doesn't allow it, for fear that the students will catch a cold.

Use fans and water evaporation indoors to cool down. For example, after wiping the floor indoors with a wet mop, turn on the ceiling fan to evaporate and absorb heat; You can also put a basin of cold water (preferably ice cubes) in front of the fan, which can reduce the indoor temperature and increase the air humidity.