I can build a solid energy model for most jobs now. But hand me a whole complicated building, every system feeding into the next, and I unravel. The numbers stop making sense and I second-guess every input. I've stared at those spreadsheets until midnight and still not trusted the result.
More people experience this than they realize.
You can model most buildings, but the big whole-building ones still defeat you.
If this sounds familiar, the Library can help you find the bigger picture.