HVAC Design That Cannot Be Built. Coordination Failures - Charles Nehme

In HVAC design, failure rarely announces itself at the drafting stage. Drawings often look complete, coordinated, and ready for construction. Yet when the project reaches site, reality tells a different story: ducts do not fit, plant rooms are undersized, services collide in ceiling spaces, and systems that were "fully coordinated" in theory become impossible to install without compromise.

This book was written from that gap-the gap between design intent and buildability.

Over the course of many years working on complex building services projects across industrial, commercial, healthcare, and high-performance environments, one pattern has consistently emerged: most HVAC failures are not equipment failures, but coordination failures. They are born long before construction begins, embedded in assumptions, fragmented workflows, and disconnected design disciplines.

Modern tools such as BIM have improved visualization, but they have not eliminated coordination problems. In many cases, they have created a false sense of certainty. Clashes are detected, but not resolved. Models are produced, but not truly engineered for installation. The result is a system that appears correct digitally but collapses under real-world constraints.

This book is not about theoretical HVAC design. It is about what happens when design meets steel, concrete, tolerances, procurement limitations, and human decision-making on site. It is about why "complete" drawings still fail, and how those failures can be prevented.

The purpose of this book is simple: to help engineers, designers, and project teams recognize coordination risks early-before they become expensive construction problems.