Part 8 of Elements of an Energy-Efficient House. The following are sources of additional information on energy-efficient houses: The Energy Efficiency and Renewable Energy Clearinghouse (EREC) P.O. Box 3048 Merrifield, VA22116 1-800-DOE-EREC (1-800-363-3732) EREC provides free general and technical information to the public on many topics and technologies pertaining to energy efficiency and renewable energy. […]