SHGC - does it only matter with direct sunshine on window?
I'm in the process of making some double pane insulated glass units as storm windows. Oberon has really helped me understand these glass/window concepts but I'm still a bit confused about SHGC.
I trying to pick glass that will have a high SHGC number to get the benefit of passive solar heat (I'm in the Northwest where summer temps rarely get very hot but winter nights are routinely in the 20's F). Half of my windows though never get any direct sun hitting them during the year. Would it be better on those shaded windows to forget a high SHGC and get a low SHGC number instead?
Thanks very much for any ideas you could share.