Building energy software tools
The Department of Energy Office of Energy Efficiency & Renewable Energy maintains a website that lists over 400 building software tools (LINK to http://www.buildingenergysoftwaretools.com/ ) for evaluating energy efficiency, renewable energy and sustainability.
I2ART has developed the software tool (platform) TechDom © as, in particular, a guide for securing and specifying modeling services - Building Energy Modeling for Owners and Managers. ( Avi demo is here)
By performing whole-building energy analysis, one can assess passive efficiency strategies (such as daylighting), reductions in cooling/heating loads, high-efficiency equipment and synergistic combinations of measures. Building energy models can also be used to support savings verification and identify non-optimal operating conditions.