I've twenty 8 week old chicks that just got put out in the coop for the first time. They were on the back porch that was around 45-60 most of the time with a heat la,p about 18" from the floor. Now they're out in a 7x8 enclosed (but well ventilated)with a heat lamp (250w red) about 3 feet from the floor. Temps are supposed to be in the low twenties tonight. Will my babies be ok? They've been out there about 3 or four hours and they're already bunched below the heat lamp laying down. It's been dark for about 5 hours now, so they may just be settling down for the night, but I don't want to wake up to 20 dead birds from exposure to the cold too quickly. Any thoughts?