We have 10 chickens in our house (breezeway) that are 3 months old. We have a lamp on them. Our weather here has been 20-30 degrees. We have a coop built inside our pole barn, with 5 chickens out there. the temp inside the coop has been around 30 degrees. We do not use a heat source out there (fear of fire), our deep little method is doing pretty good. Is it too cold to move our 10 babies out there?