i have 17 Dominique chicks at 4 weeks of age and I am hoping to move them to a 6x10 (empty) coop I just finished. I will put heat lamp in with them because here in va we are still getting cold nights ( in the 30's). Question is will they be ok in that big of a space? and when will it be ok to turn off light? the space is all open and they cant reach roost yet I'm sure so they will have the whole floor space to themselves which is fine I just need to know if they will be TO COLD??? Thanks in advance cause I know I will get good advise here!!!!!