Control failures go unnoticed
Generally all large buildings have ongoing, recurring HVAC problems. These cause either comfort problems or excessive energy consumption, or both.
Usually the systems are designed to overcome comfort problems (for example, if heating is stuck “on”, extra cooling is automatically supplied to
the energy problems this causes are not obvious, and only show up as excessive costs (and excessive greenhouse emissions).
Usually the building owners / managers / occupants won’t either notice or follow up on the increased costs, and the problems will persist. Even if they do, identifying the causes of the problems can be difficult, even to specialists.
Likewise, if comfort and noise issues occur, they are not always connected to the underlying HVAC systems and their problems.