The high temperature in Spain has killed 84 people in three days. How to prevent heatstroke in hot weather?

Open doors and windows reasonably. Many people think that when the temperature is high in summer, all doors and windows should be opened to cool down. In fact, this idea is wrong. For example, during the day, the outdoor temperature is much higher than the indoor temperature itself. At this time, if you open the doors and windows at home, the hot air outside will hit, which is not conducive to cooling down. So, if you can choose to open the window in the morning and evening, it will not only help the air circulation, but also help to remove the heat in the house? Drive away? And it can also let in cold air outside, so it is best not to open windows or draw curtains during the day, especially when the sun is too high, which is more helpful to cool down.