Energy-efficient retrofits are suggested as alternatives to conventional weatherization practices in this three-chapter report. Chapter 1 provides information necessary to help readers decide if a major energy retrofit is the right approach to a particular housing situation. Chapter 2 examines various aspects of retrofit designing, considering both interior and exterior features. Chapter 3 compares the various wall, roof, and floor retrofit strategies by cost and insulative value per square foot and also points out problems inherent in techniques for the exterior and interior and for the masonry and the wood frame structure. Appendices contain: (1) a procedure for calculating the cost and insulative value per square foot for a wall section along with over 30 tables that use this procedure to show how costs vary when materials and retrofit techniques are varied in the walls, roofs, and floors; (2) a list of selected Department of Energy Appropriate Technology Small Grants Program awards related to the retrofit of walls; and (3) an annotated list of suggested readings. (ML)