We’ve reported recently the ongoing saga of retail shops who keep their doors open, while blasting the air conditioning. This financial and environmental bad move continues to make no sense at any level.

If you’re a store or building owner of the opposite persuasion (you actually like saving money and conserving energy), there is good news. Revolving doors save a bunch of energy compared to normal ones.

Slate magazine points us to some interesting facts:

How big a difference can using a revolving door make? In 2006, a team of graduate students at MIT conducted an analysis of door use in one building on campus, E25, where they found just 23 percent of visitors used the revolving doors. According to their calculations, the swinging door allowed as much as eight times more air to pass through the building than the revolving door. Applying average Boston weather to their equations, the MIT team found that if everyone used the revolving doors, it would save more than 75,000 kilowatt-hours of energy—about 1.5 percent of the total required to heat and cool the building—and prevent 14.6 tons of carbon dioxide from being emitted.* (By way of comparison, the EPA says an average American vehicle emits about six tons of carbon dioxide over a year.)

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