Do NOT use just a regular heat lamp, I have one that has a cage around it and reflector shield. If it gets to hot it shuts off. The chickens can not touch it.I live in North Ontario, so Snow is a norm for us. Put a heating lamp, ( infrared, red bulb) at least 24 inches off the floor. I use a wide board with old carpet for them to roost on. They will uddle together underneath it there. They need to stay dry and warm, out of the wind!