Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
DesignBuilder Simple HVAC model option uses the EnergyPlus ZoneHVAC:IdealLoadsAirSystem method. This supplies hot/cold air to meet heating and cooling loads.
I would suggest to look at the System Loads graph to confirm if the HVAC system is working and producing cooling during these periods below the heating setpoint. This check should be done at zone level since you may have zones without HVAC that will also count to the building level results average.
