Question-and-Answer Resource for the Building Energy Modeling Community
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See this classic forum post for techniques to reduce unmet hours. In addition check the occupancy - you may have the system off while there is 5% zone occupancy, which will still get marked as unmet hours in EnergyPlus.
In general, it is a good idea to check zone temperature timeseries outputs to determine the severity and length of unmet hours issues. From there, it can be as simple as tweaking occupancy, thermostat tolerance, or HVAC night cycling schedules, or more severe HVAC sizing related issues.
