I have 7 chicks that are 7 weeks old and fully feathered....should I add a coop heater for below zero temps?
One thing to remember when you have chicks at the start of winter: they will be much older and bigger later.
7 week chicks in below zero temps? Might need some heat. But this is still September. By the end of November, those chicks will be more like 15 weeks old, which is almost fully grown. 15 week chicks in below zero temps? Should be fine. And if your really cold weather doesn't happen until January, you will have "chicks" over 20 weeks old, and may even be getting some eggs.