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This report is an attempt to describe the building code requirements and impediments to the application of EE and RE technologies in residential buildings. Preface to the Report This report is an attempt to describe the building code requirements and impediments to the application of EE and RE technologies in residential buildings. The goal is to include all relevant issues raised in the codes. However, because of the complex and often confusing language in the codes, this report is not necessarily comprehensive. Also, the authors are generalists in these technology fields and may not have the in-depth knowledge and practical experience of the reviewers in some specific technologies. This report was reviewed by specialists in many of the technologies, with the goal of filling in these areas. The author thanks Linda Echo-Hawk for help with the writing and review of this report. Sheila Hayter and Ron Judkoff of NREL provided funding and general guidance for the project. In addition, Sheila and Ron reviewed the entire draft report. Dr. Jay Burch of NREL provided input on the section covering active solar domestic hot water and space heating systems. Dick DeBlasio of NREL provided guidance and reviewed the material on PV systems in buildings and building integrated PV systems. Steve Slayzak of NREL reviewed the material on desiccant dehumidification systems. Dr. Chuck Kutscher of NREL reviewed the section on solar-assisted ventilation systems. Toni Smith of NREL reviewed the section on innovative fenestration systems of products.