The Energy Management Handbook, 10th edition, delivers proven strategies to optimize energy use, reduce costs, and achieve sustainability in industrial and commercial settings. This comprehensive guide, the official reference book for the Certified Energy Management (CEM®) program by the Association of Energy Engineers (AEE®), spans 24 chapters, covering essential topics like HVAC, renewable energy, energy auditing, and building automation. It also delves into advanced techniques such as cogeneration, waste heat recovery, industrial refrigeration, and measurement and verification. Offering actionable insights, it helps improve energy efficiency across diverse systems—including pumps, fans, compressed air, steam, and more—while addressing decarbonization and economic analysis for long-term success. As global energy demands rise and climate challenges intensify, effective energy management has never been more critical. This handbook consolidates decades of expertise from leading energy engineers and researchers to offer a multidisciplinary approach for tackling energy waste, enhancing operational performance, and meeting environmental goals in an era of tightening regulations and resource constraints. Designed for energy managers, engineers, and facility professionals, this handbook equips readers with practical tools to reduce energy costs by up to 50% in key systems, implement sustainable technologies, and ensure savings persist through commissioning and maintenance. From small-scale retrofits to large industrial applications, the Energy Management Handbook, 10th Edition is the definitive resource for building a more efficient, resilient, and low-carbon future.