You could have the light installed and ready and use it during the day, especially the first few days.It is a sunbeam, S85A-will test before setting it out there. My husband has me using a light also. With Michigan winters you have to have plan A & B. I have an old horse stall I'll be using. So they can gather under the light, (water&food will be stationed under light) and if they want they can huddle under the heating pad. We just had a large coyote come through yesterday, so my chicks will be kept in the barn until spring.
Adjust things per their behaviors.