President Obama ordered federal buildings to triple their original renewable energy goals equating to a 20% renewable energy mandate by 2020. http://www.cnbc.com/id/101249061 Most of the language implies that the only way to accomplish this is to increase the agencies dependence on re

When most existing buildings were built, energy efficiency was not a major concern. Curtain wall buildings from 1950 to 1975 most always contained 1/4 glass in their facades that provides very little insulation. To further complicate the issue, many of these buildings have not undergo