I believe that I'm the best candidate because I have experience and educational background in Energy modelling and Energy performance contracting.
I understand from your post that you already have the buildings 3D model ready. Does it have all the rooms/zones clearly mapped out.
To start with the following details would be needed
a. Architectural drawings including floor plans, elevation views and sectional views (DXF’s preferably)
b. HVAC description, details.
c. Internal heat gains and operational details of equipment, occupancy.
d. Construction details.
e. utility bills (optional)
f. Building co ordinates and orientation
Would you be giving me the inputs regarding the retrofits and how many different scenarios do you want to simulate taking into account the new upgrades.
Please feel to reach out to me if you need any more information.