After troubleshooting and reading more detailes about the HVAC systems in Energyplus, I found out that the output variables Air System Total Cooling Energy and Air System Total Heating Energy might include also the heating energy released by the system components of the Heatpump.
In Input-Output-Reference the following explanation is given:
System Loads Outputs
In this category, the total system load is reported. Two aspects are reported here: Heating and Cooling. The following two variables report the heat energy that system components (including packaged equipment, fans, main coils, reheat coils, humidifiers, desiccant dehumidifiers, evaporative coolers and heat exchangers) add or remove from the air loop. Each variable within these grouping wil
Air System Total Heating Energy
Heat Addition to the Air Loop (Sum of all components) in Joules
Air System Total Cooling Energy
Heat Removal from the Air Loop (Sum of all components) in Joules
In ‘Output:Table:Monthly’ format shown below.
Probably, it is better to use other output variable to monitor the operation of the heating and cooling coil, e.g.
Output:Variable,*,Cooling Coil Total Cooling Energy,hourly;
Output:Variable,*,Cooling Coil Sensible Cooling Rate,hourly;
Output:Variable,*,Cooling Coil Sensible Cooling Energy,hourly;
Output:Variable,*,Heating Coil Total Heating Rate,hourly;
Output:Variable,*,Heating Coil Total Heating Energy,hourly;
Output:Variable,*,Heating Coil Air Heating Energy,hourly;
Output:Variable,*,Heating Coil Air Heating Rate,hourly;
@Xandrika I changed your air-to-air-heat-pump tag to the more generic air-source-heat-pump.
@MatthewSteen, thanks. your are right this is the better tag:-)