If all of the various Autodesk energy analysis tools are starting to overwhelm you, check out this overview PDF whitepaper from Conceptual Energy Analysis & CFD Overview – The Sustainable Design Toolbox
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Is this only for 2011 version?
Conceptual Energy Analysis was released as part of a Subscription Advantage Pack for Revit 2011, but it is built-in t0 Revit 2012 under the 'Analyze' ribbon panel.