Dr. Vahid Vakiloroaya is a distinguished mechanical engineer with over 22 years of dedicated experience in the HVAC and building services industry. He holds a Doctorate in Mechanical Engineering and is widely recognized as a thought leader and innovator in the field. Throughout his career, Dr Vakiloroaya has contributed extensively to the advancement of HVAC systems through cutting-edge research, innovative design methodologies, and the development of sustainable building solutions. His work spans residential, commercial, and industrial applications, with a focus on improving energy efficiency, indoor environmental quality, and system performance. This book reflects Dr Vakiloroaya's commitment to empowering engineers with practical insights, proven methodologies, and reliable rules of thumb for designing efficient and effective HVAC systems.