When the balcony is hot, do you have to close the balcony window?

At 20 8 o'clock, open the window. One is good for sleeping, having enough oxygen, not stuffy. Second, it is beneficial to reduce room temperature and make people more comfortable.

8 20 o'clock, close the windows. One is to reduce the ingress of outdoor dust and reduce pollution. The second is to reduce the invasion of outdoor high temperature and slow down the increase in room temperature. Of course, you can open the windows for ventilation and then close them.