My chickens are 7 months old and after reading all the posts I just might put a red heat light in the coop. They are healthy, fat & all feathered but having a little piece of mind does sound exceptionally comforting. If it doesn't disturb their them then why not....I know I like to be warm & cozy!!
I'm averaging 7-9 eggs a day right now from 10 that lay. Funny, when I do get a full 10 it happens for a few days in a row and then it goes right back to 7, 8, or 9. Little Sparrow(no.11)....I think she has just plain given up. Maybe too much work for her, she's so tiny.