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@SG, did you confirm the proper construction is assigned to the windows in the input file, or looking at the envelope section of the EnergyPlus HTML file. I would recommend the second option. The next thing to check is to confirm that the zone that contains has a thermostat and also equipment serving it. Also, to clarify the question, are you saying the peak demand didn't change or the energy consumption annually didn't change? In either case are the values exactly the same or off by a very small fraction?