So I just picked up a plastic birdhouse with a clear back that mounts to a window via suction cups at a resale shop for all of $1. If it doesn't work out, no big loss. My question is what direction should the house face? My yard has a strong western exposure which is good for sun and wind, but I am thinking that a southern exposure might be better as it is sheltered? Comments welcome!

I am 60 miles west of Chicago, zone 4/5

Vince