Evaluation of a Multifamily Retrofit in Climate Zone 5, Boulder, Colorado (Fact Sheet)

Research output: NRELFact Sheet


In 2009, a 37-unit apartment complex located in Boulder, Colorado, underwent an energy retrofit to comply with Boulder SmartRegs Ordinance, a mandate that requires all rental properties to meet certain energy efficiency standards by 2018. The Consortium of Advanced Residential Buildings (CARB), a U.S. Department of Energy Building America team, worked with city planners and building owners toevaluate this program and recently completed a case study evaluating the effectiveness of a collection of retrofit measures.
Original languageAmerican English
Number of pages2
StatePublished - 2013

NREL Publication Number

  • NREL/FS-5500-60434

Other Report Number

  • DOE/GO-102013-4259


  • apartments
  • bill analysis
  • Building America
  • energy efficiency measures
  • energy modeling predictions
  • lighting, appliances, and miscellaneous electric loads
  • mels
  • multifamily
  • pre- and post-retrofit
  • predicted vs. actual
  • residential
  • residential buildings
  • utility bills


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