Hi @alaasaba,
Thank you for sharing the script. You are using the slider values to set the values for both opaque and window constructions. That results in a situation with both constructions having the same name.
I used the concatenate component to rename the one for the window which solved the problem.
I suggest doing the same with the opaque construction. Here is the updated file for your reference.
20241229 - MFPC Walls & Windows - Sample.gh (129.3 KB)