Hi. I am running a simplified model to optimize envelope characteristics. Actually I have a building with 9 zones (3*3 on facade). I wonder if I can consider just one of them in the middle and simulate just that zone instead of all, and consider interior walls as adiabatic? (Model(2) instead of (1) in the picture : https://www.dropbox.com/s/r0v3qg571v40v12/Capture.JPG?dl=0) If It is OK, Why the outputs for the middle zone are different? Many thanks for your response in advance @Neal Kruis, @Annie Marston