Can we export electricity consumption for each HVAC system?

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Assuming you are using EnergyPlus, you will need to add Output:Variable objects for each zone HVAC object. The output variables you can request will be described in the documentation for the HVAC component. You can add these output variables in OpenStudio with the add output variable measure and/or the output variables from csv measure. Another alternative is to make a custom meter for each HVAC component. You can use the Results Viewer to export the data. There are several other ways to export data you can find discussed on this forum.