ddawn is right, don't have to worry about cold here so much, my girls loved the cold. It's June-September that's tough for us. Insulating is good for helping to keep heat from building up in the coop, especially the ceiling/roof area, but ventilation is of utmost importance here. Since you can't see the top of the roof, I'd also coat with elastomeric rubberized roof coating, it reflects most of the light back so the heat doesn't get absorbed. I'd leave most of the front side open with generous openings in the back. When it's already 115 outside, you don't want any extra heat inside. It gets so hot, some days you wonder if they are going to survive. Fortunately, I didn't loose any to the heat in my first summer with chickens in Tucson.
Sorry you misunderstood my meaning, ddawn. The insulation is very much because of the heat. Guess I thought that was implied! Sorry I sounded clueless to you!!
I have been very interested in the posts re the heat. I have learned that people freeze water bottles & fruit & provide lots of all types of melons! Plus! Misting! I'm thinking of buying a side to side water sprinkler just for the girls! IF they still make them, that is!
My girls survived the heat of this summer too, thank goodness. I watered down the run area and gave them puddles to wade through every morning. And lots of cool fruit, vegetables and shade. My girls didn't like getting wet from the mister or the hose. My coop is more of an open style, and they'd still be panting at night during the brutal summer high humidity period. They really seem to like the cooler weather that we've had this past week; it's their reward (and ours too) for suffering through the blazing southern Arizona summer.
p.s. After receiving ddawn's post I went back the the paper I got with the chicks from Ideal.
They give 7 helpful tips; all things repeated here. Number 7 states that after 2 days of fresh water, give 3 days of vitamin supplement(Salisbury Soluble Vitamins & Electrolytes) in the water at the recommended dosage level.
SO! I guess everyone's got a different way of doing everything!
It is what it is I guess. Since, I don't have electrolytes of any kind right now. I will go tomorrow---which will be day 3!!!