Ok I couldn't take it anymore, after listening to them nervously peep themselves to sleep out in the new coop( i had to go in the house), and temps got down to 50 degrees by 10:30pm (20 colder than they've ever experienced and still dropping), I CHIKENED OUT!! not the chickens!!! Five of them were on the perches snuggled together, four on the floor huddled in a corner. Now safe in the dining room again( i'm desperate for a nights sleep!!) up to this point they've been without a light for a week in my house at 68-72 degrees What is considered too cold for 6 week old chicks? Night time temps starting this coming Sunday will be 10 degrees warmer(54-57) for a few days, here in the valley it can be 90 in the late afternoon and 50 at night so will a 40 degrees drop be to drastic and hurt them? ....Maybe tomorrow or Sunday when it isn't so cold at night?......my husband really does love me!