How to cool the mushroom greenhouse in high temperature weather

Here's the best way, which doesn't cost much: if there are caves and culverts around your greenhouse, that's the best. If not, you can dig a well with a diameter of 60 cm and a depth of about 10 m, and it's best to have water in it. If not, you should fill the well with water about 1 m, then install an exhaust fan in your greenhouse and connect one end of the exhaust fan to the well 30 cm above the water surface. (The pipe connecting the exhaust fan should be buried deeply. The purpose is to blow cool air into the greenhouse from caves, culverts or pits to naturally cool down. Of course, it is better to have grass curtains and water curtains. )