Oh, I forgot to mention in my shameless plug: I'm happy to run the model for you for specific window/overhang combinations.

Needed inputs:
Location (lat, long)
Window height (length from top to bottom of window)
Window direction (degrees east/west)
Overhang length Overhang offset (distance from top of window to bottom of overhang)

Cheers,
jolt(dot)holt(at)gmail(dot)com