Of course the graduate engineer for building services planning and building energy consulting feels immediately attacked.
Mistake, a large part of my work also involves the optimization/improvement of existing systems. Here, of course, the possibilities are limited. How often do I hear from clients:
Yes, if we had known that beforehand, then we would have... In retrospect, mostly bad luck. With solid basic assessment and system dimensioning, significantly lower operating costs would have been possible with the respective investment! In hindsight: Saved in the wrong place!
Best regards