Have you ever walked into a building in the middle of winter and noticed that you brought in a huge rush of cold air? Or maybe in the summer you’ve been tempted to go shopping when a store door was open and you felt the cool conditioned air surround you on the sidewalk?
In both of these examples a lot of conditioned air and outside air are mixing. It takes energy to heat or cool this outside air to the temperature of the indoor environment, especially in the heights of winter and summer. And those doors that let you push a button to keep them open? They are letting outside air come into a building long after you’re through the entryway. So if you don’t need to use them, you’ll save energy by skipping the button. Many buildings have revolving doors that can help us save even more energy by minimizing this air exchange.
One report from MIT graduate students in 2006 estimates that with 23% of those entering and exiting using revolving doors in one of their buildings, the building used nearly 100,000 kWh of energy to heat and cool the air exchange from opening doors. If 100% of ingresses and egresses used the revolving door, this could be cut by nearly 80% to just over 20,000 kWh a year, saving energy to heat 5.1 houses per year!
Not only does using revolving doors save energy, but it also makes the entrances to buildings much more comfortable for those who are passing through or are stationed in the lobby. As temperatures start to drop this fall, consider using the revolving door whenever you can to help save energy and keep lobbies comfortable!
By: Jeannine Altavilla