Air-Conditioning or HVAC & R is an active and fast developing technology. It is closely related to living standards of people especially on indoor air quality. Also it consumes substantial energy and related to many environmental issues such as Ozone Depletion and Global Warming etc. World demand for air conditioners is increasing exponentially. The North American market of air conditioners is second in the world next to China. Demand for air conditioners continued to grow.

There are many books available in the market on this technology. However a book which briefly explains the contractual part during implementation of this technology from practical point of view was missing and need of such book has been felt for long time. Prof. Dr. Ilango, who has been working as HVAC contractor in USA since a year, made an earnest attempt to compile his practical experience as a book to share his expertise with HVAC fraternities. His book on Heating, Ventilation and Air Conditioning (HVAC) briefly explains step by step simple explanations on the principles and applications of HVAC systems with images. This book consists of 14 chapters including appendix. The purpose of this book is to provide a useful practical and updated technical reference with actual figures or photos taken at site while executing installation of HVAC system as a HVAC contractor. Prof. Dr. Ilango has used simple language and minimum amount of complicated mathematical equations formulas to explain the theory. Approach to the subject is both fundamental and practice oriented. This book is intended to serve as a useful guide to technicians, engineers who are in HVAC business. I congratulate the author for delivering a good book. Books of this type need constructive feedback from the readers for upgradation as revised edition later. Best wishes to the authors and publisher for bringing out such an interesting book.

Dr.M. Ramaswamy, Technical Expert, Royal Court affairs, Oman

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