for conducting the field work and data collection, and Bob Mello and Heather Hanson for managing the residential field crew. Thanks additionally to our CEE co-workers Lester Shen and Rich Szydlowski for their technical input, and Joshlyn Goepfrich for scheduling home visits. Thank you to Joan Glickman at the Department of Energy for the opportunity to participate in the Home Energy Score pilot, and to Glenn Dickey, Kolleen Kawa and Hannah Wood at SRA International for managing the pilot process. Thanks also to Greg Nahn at WECC for technical assistance and training on REM/Rate. And finally, thank you to Pat Huelman and Tom Schirber at the University of Minnesota for assistance with project management and report editing. v Contents Acknowledgments .