Scientists at MIT recently conducted a study that showed if people used a revolving door instead of a swinging door when entering an office building, thousands of dollars would be saved every year per building in energy costs alone. The reason? On average, about eight times more air is exchanged with a traditional swinging door in comparison to a revolving door. A revolving door minimizes the gush of air dramatically, since it creates a barrier with the series of rotating doors.
ANDREWS MCMEEL SYNDICATION