MiaS
Songster
Are you planning on brooding your babies in your Woods or elsewhere and then moving them?I currently have seven birds so only 3 more than you and my coop is bigger so I figure we are in the same boat - lots of space and only a few little furnaces. If my incubation is successful there will be more but that introduces another complication of how much heat is supplied in their first six weeks when they need to have some "coolness" to encourage feather and down growth.
I am confident Woods will work, too many smart/experience people have experience with them and advocate for the approach; also I am damn sure my grandfather (Saskatchewan farmer) did not spend money or effort to heat no chicken coop too many other things to do.