The weather is getting down to 28 degrees in the next day or so, and I've got my 6-7 wk olds in the coop. I have a hanging brooder light out there (see pics in this thread) https://www.backyardchickens.com/forum/viewtopic.php?id=44312 And a carboard box under the light to trap heat. There are 20 of them in the coop, and it's a 8x16 coop. I've got lots of litter down for them, and I've got GreatStuff insulation filling all the cracks so no wind gets in. Is it safe, or should I bring them in????