This best-selling handbook is the most comprehensive and practical reference available on energy auditing in buildings and industry. Completely edited throughout, this latest edition includes new chapters on investment grade energy audits and retro-commissioning audits, as well as new information on ISO 50001 and the Superior Energy Performance program. Topics include energy assessment, utility bill analysis, and the latest computer software available to guide you in planning and carrying out a thorough, accurate audit of any type of facility. Clear instructions guide you through accounting procedures, rate of return, and life cycle cost analysis. Loaded with forms, checklists and handy working aids, this book is must reading for anyone responsible for conducting or overseeing a facility energy audit.