It is very hot in summer. Is the balcony window closed or open in the morning and evening?

20~8 o'clock, open the window. One is conducive to adequate oxygen when sleeping, not boring. Secondly, it helps to lower the room temperature and make people more comfortable.

8 to 20 o'clock, close the window. One is to reduce the entrance of outdoor dust and reduce pollution. The second is to reduce the invasion of outdoor high temperature and slow down the rise of indoor temperature. Of course, you can open the window to get some air and then close the window.