The U.S. Department of Energy and its National Renewable Energy Laboratory (NREL) have released two technical reports that provide recommendations on how to achieve 50% energy savings in large office buildings and large hospitals. Conducted by NREL’s Commercial Buildings Group, under the direction of DOE’s Building Technologies Program, the studies support DOE’s goal of significantly improving the energy efficiency of new and existing commercial buildings across the United States.
http://apps1.eere.energy.gov/news/progress_alerts.cfm/pa_id=409