An evaluation by the U.S. Department of Energy uncoveredthat buildings account for 40% of all energy use in the UnitedStates, more than either industry or transportation. US Buildingsalso account for about 9% of worldwide carbon dioxide emis-sions, more than Japan, France and the United Kingdom combined[23]. Energy use has grown in both residential and commercialbuildings across the US, and while residential energy consumptionexceeds commercial, the latter has been increasing more rapidly,from 14% of total U.S. energy consumption in 1980 to 18% by2005 [23]. This substantial overall energy consumption means thateven proportionally small energy savings can produce meaning-ful environmental benefits allied to reductions in economic costs.Nevertheless, most of the literature on social norms and energyconservation focuses on energy consumption at the household level[14,24,25].