Those three small ones are not enough.Oh that was very helpful! I called my husband over and we watched together. We are going to remove that tilting rooting bar that the chickens don't use and add a long bar the way you said. There is actually another door in the coop area where your finger was that is probably 1/3 of the left side wall that I can open. My husband has gone out and opened it. Sounds like we should leave it open all winter. There are 3 small ventilation corners on the other side of the coop at the top. I will update some pics tomorrow. I am going to bed. That you for all your time!

Get some pics tomorrow with the door open, please.
So sorry for your loss
For lighting I use solar garden lights. No need to worry over batteries. I really like the rope lights,you can run the strand of lights inside and have the charger outside. The ones I have are soft white,enough that they can see but not so bright that they don't sleep.The goats like theirs too!
