I have 5 silverlaced wyandotte bantams that are now 8 weeks old. They are kept in our garage in a brooder, i usually have a heat light on at night, but have had it off for the last 2 days as i am unsure as to wether to put them outside? They have out grown their brooder. I am worried its too cold, it about -1 at night at the moment. What do you think i should? They are fully feathered and look healthy, i think i should but them outside, but am afriad to find the dead or ill in the morning. any advise please.