I have an area rug over part of one wall and plastic over the people door for winter, but my coop still has a bunch of sq ft of hardware cloth covering openings, and it is airish in there, I simply took the wind off the roost area. Really, you do not need a heat lamp in Georgia. People in Alaska have successful unheated coops. And yes, a 3 sided setup is fine in Ga. When you see them panting and holding their wings away from their bodies this summer, you will be glad to have a lot of breeze in there (air blowing in winter over the roost is a draft but in summer it is a welcome breeze.) Wood shutters are about a necessity in a 4 sided coop here, for the summer breeze.
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