I'm in the midst of building a new coop for 20 ladies (in the VA WV area). The coop is 8ft x 8ft with a gabled roof that's just about 7ft. high at the ridge. I'm using the deep bedding method and have all the details worked out but how big of a hole the soffit should be. It doesn't get horribly cold here but because this is an opening in the coop I dont want it too drafty!