In AutoCAD MEP, you use spaces to model the interior areas of rooms as explained in Adding Spaces to a Floor Plan. You group the spaces into zones that represent the real-world heating and cooling zones. See Attaching Spaces to Zones for more information.
After you create spaces and group them into zones, you can export the information to a file in the Green Building XML (gbXML) format as follows.
If necessary, you can scroll down to locate the command from the list.
