This book is a self-study guide for HVAC energy and non-HVAC energy engineers and plant managers who either lack formal training in the subjects of finance, accounting, and gas IR heating engineering economics, or simply need a means to refresh their knowledge in these subjects. Many energy and non-energy engineers and technical managers feel inadequately equipped to comprehend and apply certain important finance and accounting principles. Understanding of finance and accounting principles is important in interfacing and conducting business with accountants, financial analysts, and members of upper management. This book is designed to familiarize energy engineers and other engineering professionals - in a relatively simple and easy to understand fashion - with decision making skills founded on financial calculations and case study based quantitative analysis.