I live in British Columbia, Canada, I have 4 chickens that live in a 6 x 12 insulated coop with an automatic door. ( I know, too big of a coop for only 4 chickens). We planned at first to get 20 chickens but have only 4 as they are from my son's school and are part of our family. I've read tons on here about NOT heating the coop unless its really cold. We've just had the lows of -17 Celcius and it only goes to a high of -14 Celcius (sorry I do not know the conversion to Fahrenheit.). What we have done is put a heat lamp in the coop on a timer to go on at 1am till 7am. What I am worried about is them being able to acclimatize. I'm also concerned about ventilation. I don't understand if you are supposed to seal up all areas for wind how do you also have ventilation? I am very worried we are doing it wrong and I worry till wee hours into the night. Will you please tell me at what temp should I be worried? Thanks so much!!!