Don't do heat lamps they start fires. Get a cozy coop it's a panel that puts off her when they are next to it and it's not a fire hazardI currently have welded wire mesh for my windows, which are great for ventilation in the coop in the summer, but I am looking for ways to winterize.
We are in Cental Louisiana, so it doesn't get too cold, but I want them to be comfortable.
It's far from perfect, I barely knew how to use a drill when I started. It took me 2 1/2 month, including the run. And I still have some touch ups, but Harvey ruined my plans. Ideally I'd like to add sides to the "lean-to" to protect their food from the rain.