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You need to look at the Input/Output reference guide for Zone

The cooling/heating "loads" are the following two variables:

HVAC,Average,Zone Air System Sensible Heating Rate [W]
HVAC,Average,Zone Air System Sensible Cooling Rate [W]

You'll note that we're talking here about sensible cooling.

If you want to get total cooling, you need to look at the HVAC system. If you don't have a specific HVAC system designed in your model, you should put a ZoneHVACIdealLoadsSystem and report the following variables (especially the last one which is the sum of the first two):

HVAC,Average,Zone Ideal Loads Zone Sensible Cooling Rate [W]
HVAC,Average,Zone Ideal Loads Zone Latent Cooling Rate [W]
HVAC,Average,Zone Ideal Loads Zone Total Cooling Rate [W]

If this is for sizing purposes, it's worth also noting is that you should really use the Sizing:Zone objects for this. You'll get a epluszsz.csv file where you'll have a row for each zone where you have a Sizing:Zone, and that specifies the load (see output description)