Question-and-Answer Resource for the Building Energy Modeling Community
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You are using ZoneHVAC:IdealLoadsAirSystem objects, which are idealized HVAC systems w/ COP of 1. They do not represent realistic equipment and are accounted for in EnergyPlus as district systems (i.e., outside the building facility) that perfectly meet the thermal load. Even if you somehow accounted for the district system use in your energy costs, it would not be a meaningful result.
The only way to get meaningful energy cost impacts is to model a real HVAC system with an efficiency and fuel type.
