Many thanks for your answer. In fact, I was looking at the temperature at the system nodes 30, 31, 32 and 33 which are the nodes of the inlet and the outlet water temperature of the heat pump on cooling and heating.

On the other hand, I do not know why the central forced air system does not help the heat pump in achieving the thermal comfort in the thermal zones which is 20ºC in winter and 25ºC in summer as it is supposed. For my model now I still have high heating hours not met setpoint. What parameters i need to modify in the model to reduce the not met setpoint heating hours.

Many thanks

What parameters i need to modify in the model to reduce the not met setpoint heating hours.

That is another question. Wasn't my previous comments helpful? Or have you checked many tips listed in this old post?

Thank you for your answer.

I have corrected the model previously following your previous helpful comments, but I am still obtaining high heating not met hours specially in the three zones of the Auditorium Air Loop.

I was wondering why the model is not able to achieve the thermal comfort and heat the thermal zones enough to achieve 20ºC in winter.

Regarding the previous question, the inlet and the outlet water temperature of the heat pump which are presented in the two pictures in the link below: https://drive.google.com/drive/folder... still does not match while heat pump is off, I would like to know of what do you think about it please? Many thanks in advance,

The temperature difference between NODE 30:System Node Temperature and NODE 31:System Node Temperature while heat pump is off does not matter because System Node Mass Flow Rate is 0 and Heat Pump Electricity Rate is 0 while heat pump is off. If you still stick to how System Node Temperature is displayed while System Node Mass Flow Rate is 0, you can report it here to the EnergyPlus developers as a bug report.