how cold can sultans take here in texas. i am new to the chicken world. i have built a coop sized 20'x30' and is divided into 5 smaller coops. they have chicken wire for the walls only and was wondering if i should have put up something better or can i put up a tarp for just the cold times.? please help me out before i lose any of them. all my other birds can with stand the cold. thanks for any and all the advise that i get for you all.