Seeking clarification of building vintages role + script's output

Hi,
My colleague wants to make sure this script is correct for simulating heating/cooling etc. energy loads according to ASHRAE standards (for a LEED building).
Energy according to facade fabric.gh (151.0 KB)
I’ve deconstructed the program to find assumptions, but what does inserting building vintages ensure? (It didn’t seem to change the setpoints etc of the program).