Energy savings programs/software

When bidding on large buildings, it would be nice to be able to offer an energy savings calculation. Does anyone know of any programs or softwares out there?

Theres Demand Analyzer,,,,I think they upgraded it to a new name now though,,Bekarert has a program,,way too complicated for me You have to have all the specs of the building, usually from the engineer or architect,,,I would just call Bekaert directly,,

most of the MAJOR mfg's have adopted the demand analyzer that TC mentioned to their films ask, your distributor.
there are also some downloadable software programs from lawrence berkely labs that could be useful perhaps if one has the time to play with them and adapt them to film applications

Madico and CPfilms both has excellent easy to energy analysis/pay back programs that they offer at no charge if yo are a regular customer. Both are based on DOE2 guidelines which most engineeers respect. I suggest developing a relatuinship with your film supplier and suggest that you work together on the project.