Quote: Perhaps the difference is that your coop is located out in the open, far from trees.
My location was picked because it was high and dry, which is a premium here. ONly a few spots naturally occuring on the whole 15 acres. THe location of my coop is next to the property line so the neighbors trees will always block some light.
THe windows are a good 2 1/2feet deep and 11 across.
I do think more windows would be beneficial-- I look for used windows waiting for trash pick up or listed as FREE.