Question-and-Answer Resource for the Building Energy Modeling Community
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I would calculate the total value for each of the day schedules, then use this method
https://github.com/NREL/OpenStudio/blob/develop/openstudiocore/src/model/ScheduleRuleset.hpp
to figure out which day schedule is active throughout the year. Then you can just add up all the values for the active day schedules.
