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The loss of temperature control is likely due to undersized cooling coil(s). You can tell this by looking at a day where the temperature set point is not met and reporting the cooling coil sensible capacity, part-load ratio, air flow rate, etc. where you should see that the coil is operating at maximum capacity. If autosizing, check the Sizing:Zone and Sizing:System objects. If not autosizing, check the coil inputs and selected air flow rate.