Question-and-Answer Resource for the Building Energy Modeling Community
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You may need to add more information about your building to get a good answer to this question. At what time of day is the building peak in October? What directions do the various walls face? What is the window to wall ratio on each face of the building? What is the form of the building? Are there a lot of core zones which would be internal load dominated for cooling (wide floor plate) or are there more perimeter zones (narrow floor plate)?
When you say that the building peak load is in October, where are you getting this information from? Is it from the LS-C report? Does the building peak cooling load include outdoor air or is it for the envelope only? The LS-C report does not typically include the load for cooling ventilation air, which may be affecting the timing of the building peak.
As for your south facing zones, they will get more low angle sunlight in the winter than in the summer, and this is likely responsible for the higher cooling load in winter.
