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You can find an overview of output variables that the ZoneHVAC:IdealLoadsAirSystem can generate. I would assume that you are most interested in the Zone Ideal Loads Supply Air Total Cooling Rate and Zone Ideal Loads Supply Air Total Heating Rate. Note that an ideal loads air system object is connected to only a single zone, so if you are trying to determine the thermal demand of the whole building, you will need to parse through multiple columns of data in the output CSV file because one column is generated for each output variable generated by each object. For example, if you wanted to see thermal demand in two zones, you would parse through four columns (heating and cooling for each zone).