Completely revised and updated, this fifth edition of a bestseller helps building managers identify what to look for and how to evaluate before making a decision about which guarantee is better for their building and which ESCO can best deliver energy savings. This reference will save countless hours doing energy feasibility studies and associated calculations. The author, a practicing engineer, shares his secrets for simplifying complex energy calculations and demonstrates his unique, time-saving methods. Key topics covered include energy myths and magic, the walk-through audit, lighting, pumps, fans, motors, insulation, fuel switching, heat recovery, HVAC and a summary of energy calculations.