The authors wish especially to acknowledge the contributions of Schaad Companies, which acquired the land and built the test houses for this research at their own expense, and leased them to ORNL for $1 per month for the duration of the project. Without Schaad Companies this research project (and many others utilizing a total of four test houses) would not have been possible. In addition, ClimateMaster, Inc. donated the water-source heat pumps installed in the test houses and used in the research reported here. This and other research projects, reliant upon the same test houses but not the subject of this report, also benefited from contributions of materials and expertise made by additional industry partners of Oak Ridge National Laboratory, as acknowledged at www.zebralliance.com. ZEBRAlliancea publicprivate partnership to maximize cost-effective energy efficiency in buildingswas co-founded by ORNL and