Yes, not interested in pests nor having my chickens feast on insulation. The ceiling is out of their reach so will try that. Have to decide whether to try the hard insulation boards on the walls (not the white stuff) or something else. Thank goodness for the windows in the coop. They're screened with an additional heavy screen on top and really help change the air / keep the coop from getting stuffy / damp. Not sure how much the 2 vents at the top help but the windows are great. Long may this fall last before the snow flies!Remember too, that insulated walls tend to hide pests in several forms, so the lighter you on the insulation the better! I've also seen poultry go to town on the foam insulation boards! If you decide they might be a good easy idea for the coop ceiling, just be sure they're out of reach. Don't know what's so tasty about it, but the way they go at it makes it look 10x more desirable than a warm mash with a meal worm topper!
My biggest worry in Niagara would be the damp days, so keep an eye on the moisture levels. I added an exhaust fan for those gloriously wet humid ontario summeìrs, to draw some of that moist air out for super easy cheap fix but it could easily work for the winter too (just watch for dust build up if you do)! But if you really want to get an idea of how warm those little ladies can be, snuggle a hen on a cold day!