I know the winters in North Texas are normally mild. However, I didn't think I could close off all of the drafts in my chicken tractor. I plan on placing the roosting bars on the wall directly across from the large front door & the nesting boxes just to the left of the door. Roof Gable vents on both ends to be installed. a window on both sides, framed in but not cut out in siding yet. Repurposed mobile home windows screened with Hardware cloth. Vented area along both sides by rafters that will be covered with hardware cloth. There will be roof shingle ridge vent. The girls supervised most of the work. However, they do not allow them to use power tools. @aart , what do you think?