simulation heating setpoint deadband

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I have the following problem with my simulation in Energyplus:

I am working on a project where I implemented a dual setpoint thermostat with a cooling (26°C) and a heating setpoint (22°C). However I can't see where to implement the deadband for the heating setpoint. In reality there is in the operation of the system a deadband on the heating setpoint. If the temperature in the zone is above 22°C the heating is switched off, if then the temperature in the zone drops below 22°C its still ok since there is a deadband of 0.5°C. The heating is switched on the moment the temperature drops below 21.5°C. I tried with EMS but then the heating is switching on/off continiously and changes the heating setpoint which I want to keep at 22.

I know that in other building simulation tools there is sometimes a differential thermostat with a deadband. However, this is not the case in Energyplus since it uses part load modelling. I asked the support desk of Energyplus but they say it is not possible since Energyplus knows the zone load and can find in this way the system operation to meet the heating setpoint.