Hello there I am I first time chicken owner so this will be my first winter with my girls. I have two BR an EE and a sexlink. Theyre coming up on 6 months old now. I have a smaller coop that is elevated off the ground about three feet its blocked from the wind but the walls are just plywood. There's hay for their bedding and two windows that open and close. Im not sure if I need to insulate the walls, if I need a heater, what kind of heater, what kind of insulation, or if i need both. I live in Nampa Idaho and our winters usually arent to bad but they can be unpreditibale as well. How cold is to cold for the girls? I can use all the help I can get on this one so any suggestions would be very helpful!