MassZones are created from the MassEnergyAnalyticalModel. They are conceptual representations of individually heated and cooled sub-volumes of a building. 
   Namespace:   Autodesk.Revit.DB.Analysis  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 23.0.0.0 (23.1.0.0) 
  Since:  2012 
Syntax
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Remarks
 MassZones are created by dividing a MassEnergyAnalyticalModel into pieces by intersecting MassLevelDatas associated with a Mass FamilyInstance with the geometries of the MassEnergyAnalyticalModel associated with the same Mass FamilyInstance.