



Autodesk Ecotect can measure how fundamental criteria, such as solar, thermal, shading, lighting, and airflow, will affect building performance in the conceptual and detailed phases of design. This capability to forecast building performance over time better equips architects and engineers to deliver more energy efficient and sustainable building designs.
Autodesk Ecotect is a separate program and is not integrated into AutoCAD or Revit. It does the calculations using the gbxml analysis data that is exported from the BIM model. So you need to setup your model with rooms if you're using Revit Architecture, and with spaces if you're using Revit MEP.

Below is a white paper on how to prepare your BIM model for the export to the gbxml file.
Click to link below
Using Green Build With Revit Whitepaper by Autodesk
This document helps you get started with Autodesk® Green
Building Studio® web service and presents the fundamental
concepts of the product, including:
The Autodesk Green Building Studio analysis tools, now available at http://www.autodesk.com/greenbuildingstudio, provide improved design insight through whole building energy, water and carbon-emission analysis, helping architects and designers to maximize building economic and environmental performance. The tools are compatible with Autodesk design software as well as software from other industry providers through the Green Building XML (gbXML) schema and can now be directly accessed from within the Revit platform for BIM with a new plug-in now available for download. Green Building Studio Inc. launched the Green Building Studio web service in 2004.The Autodesk® Green Building Studio® web-based energy analysis service can help architects and designers perform whole building analysis, optimize energy efficiency, and work toward carbon neutrality earlier in the design process. With faster, more accurate energy analysis of building design proposals, architects and designers can work with sustainably in mind earlier in the process, plan proactively, and build better. With the Autodesk® Green Building Studio® web-based energy analysis service, architects and designers can evaluate building components for impact on energy consumption as well as improve economic and environmental performance early in the design process. Compatible with Revit MEP The Autodesk Green Building Studio service is an analysis tool that interoperates with Revit® MEP and other compatible energy-analysis software and facilitates team collaboration and information sharing at all stages of design. Evaluate Energy Profiles of Building Designs Green Building Studio tools enable architects and designers to evaluate the energy profiles and carbon footprints of various building designs. Files are shared between engineering software programs and among engineers and architects early in the design cycle, making sustainable design more efficient and cost effective. With Autodesk Green Building Studio tools, you can
Autodesk Green Build Studios Q&A (pdf - 52Kb) Autodesk’s acquisition of Green Building Studio’s assets was completed on May 1, 2008. They've completed the migration of the web service to Autodesk’s hardware. New users and existing Green Building Studio customers can now access the web service in the following manner.
Users of Autodesk’s Revit®-based software applications who register for the Autodesk Green Building Studio service can now access the service directly with a plug-in available from our Downloads page after login. If you have questions about a new or existing account, please contact their technical support staff directly via email. Technical support can be reached at support@greenbuildingstudio.com.