When should you ventilate in hot weather?

On hot days, it seems like a good idea to open the windows to let in as much air as possible. But did you know that this can actually increase room temperatures even more? It is important on hot summer days to limit ventilation to times when it is coolest, such as at night or early in the morning. In the office, it should be the first person to enter the room in the morning. It is also advisable to ventilate across, that is, to open opposite windows to increase airflow. It is particularly important to avoid direct sunlight in the apartment, as window glass lets the heat in but not out. Use shutters, blinds, and awnings during the hot hours of the day to keep the heat out