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It sounds like you are only running the two summer/winter Design Days, which are used for purposes of HVAC autosizing. You need to tell EnergyPlus that you want to run the full annual run period.

In the OpenStudio application, you can run the annual simulation by going to the Simulation Settings tab, make sure the Run Period is Jan 1 - Dec 31, and turn on Run Simulation for Weather File Run Periods.

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