How to access the HVAC electricity consumption for each thermal zone?

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Here is what I belive you need to do:

Let's say you have two zones A and B. get the output variable : Facility Total HVAC Electric Demand Power. Now you need to get for each zone the following two output variables: Zone Ideal Loads Zone Total Heating Rate and the Zone Ideal Loads Zone Total Cooling Rate. Note that I use Ideal Air load System but you will have to adapt it to whatever system you use. The easiest would be to have all the output variables in hourly rate.

To get the electrical power demand of zone A you will need to sum the total Heating and Cooling and divide Zone's A sum by Zone A + Zone B sums and then multiply by the Facility Total HVAC Electric Demand Power and you are done.