1. Assistant Professor, Civil and Environmental Engineering Dept., Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA 15213 (corresponding author).
2. Measurement and Verification Specialist, Vermont Energy Investment Corporation, 128 Lakeside Ave., Suite 401, Burlington, VT 05401.
3. Professor, Civil and Environmental Engineering Dept., Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA 15213.
4. Ph.D. Candidate, Electrical and Computer Engineering Dept., Carnegie Mellon Univ., 5000 Forbes Ave., Pittsburgh, PA 15213.