This book provides a comprehensive guide to conducting energy audits for residential and commercial buildings. It details the methodologies, tools, and analysis required to identify energy inefficiencies and recommend cost-effective improvements, aiming to reduce energy consumption and operational costs.

The book is likely regarded as a practical, technical manual for professionals and homeowners interested in energy efficiency. Its focus on 'investment grade' suggests a data-driven approach, emphasizing the financial returns of energy audits. The content would appeal to building managers, contractors, and sustainability consultants seeking to optimize building performance.