Welcome to this exploration of the critical intersection between Heating, Ventilation, and Air Conditioning (HVAC) systems and public health. It's no secret that the built environment we inhabit significantly impacts our well-being. This book delves into how HVAC systems play a central role in creating healthy and comfortable indoor spaces, ultimately shaping public health outcomes. This book is intended for a broad range of professionals, including building engineers, architects, facility managers, and public health specialists. It also serves as a valuable resource for students seeking to understand the synergy between these disciplines. Whether you're already familiar with HVAC systems or just starting your journey, this book aims to provide a comprehensive and accessible understanding of the subject. The opening chapters establish the foundation by exploring the importance of indoor air quality (IAQ) and thermal comfort for public health. We'll delve into the basic principles of HVAC systems and their role in buildings. Additionally, we'll touch upon emerging public health challenges and how HVAC systems can contribute to solutions. As we progress, we'll dedicate in-depth chapters to various aspects of HVAC and public health. We'll explore ventilation strategies, air filtration and treatment methods, and the crucial role of humidity control. The importance of building commissioning and ongoing maintenance is highlighted, ensuring optimal performance and IAQ. Moving forward, we'll examine how HVAC systems are tailored for different building types. From hospitals and schools to residential buildings, each space has unique needs. We'll delve into strategies for balancing comfort and IAQ with energy efficiency across these diverse settings. Sustainability is a growing concern, and the book will explore the concept of "Green HVAC Systems." We'll discuss sustainable design principles, renewable energy integration, and strategies for reducing the environmental impact of HVAC systems. The impact of public health emergencies on HVAC operation is a crucial topic. The book will explore how HVAC systems can play a role in controlling the spread of airborne diseases. We'll discuss strategies for operating them during pandemics, alongside the potential of emerging technologies for pathogen control in buildings. Finally, the book will touch upon relevant codes, standards, and regulations to ensure public health protection. We'll explore emerging technologies in ventilation, filtration, and air quality monitoring, along with the exciting possibilities of smart building technologies for optimizing HVAC performance and IAQ. This book is not simply a technical manual; it emphasizes the holistic approach necessary for creating healthy and sustainable buildings. By understanding the link between HVAC systems and public health, we can create spaces that promote occupant well-being and contribute to a healthier future. Let's embark on this journey together!