The modern built environment is entirely dependent on its heating, ventilation, and air conditioning (HVAC) systems. We take comfort, productivity, and health for granted until the air stops flowing, the pipes freeze, or the temperature swings out of control. When an HVAC system fails, it is not merely an inconvenience—it is often a major financial hit, a disruption to operations, and, at times, a threat to human safety. The fundamental question we address in this book is simple: Why Do HVAC Systems Fail? The answer, however, is complex, multifaceted, and often hidden. Failure is rarely an accident; it is a predictable endpoint resulting from a cascade of factors, starting from initial design flaws and poor installation to long-term operational neglect and misinformed troubleshooting. Drawing on decades of global experience in both design and consulting for complex mechanical systems, this book strips away the mystery surrounding HVAC breakdowns. It moves beyond superficial repairs to perform a deep, systematic root cause analysis, examining component failure, thermodynamic principles, electrical weaknesses, and human error. Our goal is to equip readers—whether they are homeowners, facility managers, or fellow professionals—with the knowledge to not only diagnose problems effectively but, more importantly, to design, install, and maintain systems that are built to last. This is your definitive guide to understanding the silent saboteurs that undermine efficiency and reliability, transforming you from a passive observer of system failure into a proactive custodian of resilient building performance.
