Integrated Environmental Solutions, with REVIT!

IES Virtual Environment
"There is now a direct link between the 3D modelling platform Revit and the IES . Jointly developed between IES and Autodesk, it represents a revolutionary change for design teams working from a common model. Not only does IES software calculate heating & cooling loads within Revit MEP, but the suite can be launched in order to carry out the full range of sustainable design analyses"... Looks like I should learn Revit.

via Treehugger