When I adjust the properties of window frame/divider objects, it asks for a frame 'conductance'. According to previous forum responses, this is not the same thing as U-value even though the units are the same (https://unmethours.com/question/25571...) I only know about the typical U-values of frames (e.g 0.9 (IP) for thermally broken aluminum)- how do I convert that to a 'conductance'?