So I live in Northern NH and I have 2 NH Red Hens. they were born on April 29th 2009. I used to have a flock of 5 but 3 of them got killed and one got injured but survived. I was really cold, so I had kept them in the basement but now I have no other option but to put them back into their coop that is not insulated. I just checked the weather for tonight, and it says it's supposed to be 16 degrees tonight. My question is, will my chickens be able to survive in the coop even if the temp drops below zero?