Sukkasi and Dan Wesolowski concluded, "...substantial energy is saved when people use the revolving doors instead of swing doors - the smallest of habit changes contributes to energy conservation... Modification of one habit... indeed has the ability to eventually impact the environment on a global scale." While preferred by building owners for energy conservation, revolving doors may be avoided by some people due to the perceived greater physical effort in using them. See also Revolving door (politics) Turnstile Paternoster lift References Further reading Alan Beadmore, The Revolving Door since 1881: Architecture in Detail, 2000, Harvey E. Van Kannel and Joanne Fox Marshall, T. Van Kannel, the inventor : his autobiography and journal, 1988, External links Sustainability/Energy Savings/Stack pressures (MIT study) Modernism/Modernity : Perpetual Revolution International Revolving Doors History American inventions Doors 1899 introductions Articles containing video clips Door