I attempt to place two windows in a mew. The choice of placement is to gain benefits from the sun yet minimize drafts that sap the birds energy. I want to also create situations where the bird(s) can get out of the direct sun, rain, snow or drafts from a window. So you want circulation of air during hot days but not drafts during cold days.

One of the two windows of this mew is placed to get morning sun and the other afternoon/evening sun.