Hi @CheneyChen @Aayushi,
I am able to recreate this issue when I use a room that has no “INTERNAL SOURCE” construction applied correctly. So after you applied the construction for “INTERNAL SOURCE”, you have to use the new rooms for creating an HBModel.
You can also use this sample file that I have a room added to the system.
Note: document is set to Meter.
20230502_Room with Radiant Panel_MP.gh (77.7 KB)
