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To model a constant volume system when would I choose a cav system such as that in 5ZoneCAV_MaxTemp.idf example file vs using a AirLoopHVAC:UnitaryHeatCool object. For my test model, I see a significant difference in the heating energy use in the two cases.

To model a constant volume system when would I choose a cav system such as that in 5ZoneCAV_MaxTemp.idf example file vs using a AirLoopHVAC:UnitaryHeatCool object. For my test model, I see a significant difference in the heating energy use in the two cases.