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Principles of Heating, Ventilating, and Air Conditioning is a textbook based on the 2013 ASHRAE Handbook—Fundamentals. It contains the most current ASHRAE procedures and definitive, yet easy to understand, treatment of building HVAC systems, from basic principles through design and operation. It is suitable both as a textbook and as a reference book for undergraduate engineering courses in the field of air conditioning, heating, and ventilation; for similar courses at technical and vocational schools; for continuing education and refresher short courses for engineers; and for adult education courses for professionals other than engineers, especially when combined with ASHRAE Handbook—Fundamentals. The material is divided into three major sections: general concepts, chapters 1–10; airconditioning systems, chapters 11–16; and HVAC&R equipment, Chapters 17–19. There are several significant changes in this revised edition. Chapter 4 has a new format as well as new values for climatic design information. Chapter 5 has a new table for typical thermal properties (resistance and thermal conductivity) of common building and insulating materials. This includes new values of heating, wind, cooling, and dehumidifying design conditions. Chapter 7 has been extensively revised with new design data. In addition, the chapters on system design and equipment have been significantly revised to reflect recent changes and concepts in modern heating and airconditioning system practices. This book includes access to a web site containing the Radiant Time Series (RTS) Method Load Calculation Spreadsheets, which are intended as an educational tool both for the student and for the experienced engineer wishing to explore the RTS method. These spreadsheets allow the user to perform RTS cooling load calculations for lights, people, equipment, walls/roofs, and fenestration components using design day weather profiles for any month. Cooling and heating loads can be calculated for individual rooms or block load zones. Twelvemonth cooling calculations can be done to determine the month and time of peak cooling load for each room or block load zone. In addition, room/zone worksheets can be copied and modified within the spreadsheet to analyze as many rooms or zones as desired; the number of rooms/zones is limited only by the available computer memory.