The document provides an overview of a technical guide for incorporating energy efficiency into HOME-funded affordable housing projects. It discusses the purpose and history of the guide, how it is organized, and how project staff, CHDOs, and developers can use it. The guide contains strategies for encouraging efficiency, descriptions of common measures, tools for determining cost-effective measures, and energy and cost savings models for different climate zones. It is intended to help stakeholders identify and promote appropriate efficiency actions for various project types.