Walk into a shopping mall. If the doors remain open to help shut down because there are many area malls, because when the doors remain open air, it will even work harder to cool.
Walk into the mall If the door is left open to help off. The mall has more space. Because when the door is left open Air, it is extremely hard to get a cold. Which causes it to heat a large scale environment.
When walking into the department store. If the door is left open to help close. Since the mall area. When the door open? The air would be more hard work to get cold.