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[EnergyPlus_Support] Re: HVAC FourFanCoil doesn't work correctly

Your system is autosized. Changing the setpoints is not greatly going to effect the system energy usage. If your room has a constant 10 deg C or a constant 20 deg C, the energy usage will be similar. Your system capacity will be auto sized to meet whatever worstcase scenario is appearing in your sizing design day, because you have chosen to auto size it. If you have a fixed capacity and want to see when it is not sufficient, then you must hard size the equipment (replace "autosized" with numbers) and report the hours setpoint not met as an output variable to see when and how much. If you have a changing setpoint, i.e. setback temperature, for example 18 degC during winter nights, then the sizing of the equipment also becomes more tricky even with auto sizing, because you can use a different temperature profile for the design day, but also you could use different setpoints. For example, standard is to use a constant temperature setpoint for sizing, as using a changing setpoint coupled to a worstcase weather profile could end up in realy big equipment capacities.  

I'm not exactly sure what you are trying to do or expect to see.  



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