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According to the Building Technologies Program's 2009 Buildings Energy Data Book

Residential Data

  • The United States had approximately 113 million residential buildings.
  • Residences accounted for 21% of primary energy consumption in the U.S. and 20% of carbon dioxide emissions.
  • $225.6 billion was spent on energy for residences.
  • 59% of homes were built in 1979 or before. 

Commercial Buildings Data

  • The United States had 74.8 billion square feet of commercial floor space in 2006.
  • Commercial buildings represented 18% of primary energy consumption in the U.S. and used 36% of the nation's electricity in 2006.
  • In 2006, $190.5 billion was spent on improvements and repairs to commercial buildings.

As of 2003, 54% of commercial buildings were built in 1979 or before.