If my chickens need heat i provide it for them , not to the excess but to make it bearable for them . They are living creatures much like us and if we are miserable when freezing then so are they . To much of freezing temps in their life can't help but effect them in the negative way . I've been out in the elements during my time in the military , being caught out in the cold weather trying to sleep in an old abandoned house we found , the back walls had been blown out but we had a wind break . We did not sleep a minute the whole night because we were freezing . A few more nights like that and i don't think we would have made it .
It's not gonna hurt to put some heat in for birds that need it , it will lengthen their lives and make them much happier .
That's all i got to say , so have a good night in our nice and warm homes "Thank the Lord" .
Shannon