Percentage of energy-efficiency remodeling products that are manufactured in the U.S.
Home Performance Resource Center
Workers in 16,500 factories who were certified through U.S. Training Within Industry programs, 1940-1945
Americans’ annual energy costs
Energy Information Administration
Projected size of energy-efficient home improvement market by 2014 ($38.3 billion in 2009)
Projected size of home energy auditing business by 2014 ($8.1 billion in 2009)