This book helps energy auditors or retrofitters, whether they work in the weatherization program or in the private arena, to prepare for several certifications. The book contains industry procedures and techniques and is intended to be an educational resource. Topics covered include the house as a system, the auditor¿s tools, weatherization, sealants, insulation and barriers, retrofitting, heating and cooling, baseload, and new construction. A number of additional appendices are included to provide the reader with valuable information in the performance of a residential energy audit.