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The 1st thing to do here is to identify which zones have more unmet hours reported. This information is available at the Summary report "Time Set point Not met".

Then you will need to analise how the HVAC system is performing on these spaces and if the temperature setpoints are set up correctly and being met by the system.

Have also a look at this post: https://unmethours.com/question/359/what-are-your-techniques-for-reducing-unmet-hours/

Its not specific to DesignBuilder software but the approach is similar.

If you have a valid DesignBuilder license then you can always contact DesignBuilder support team for assistance.