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Best wishes with your flock! Welcome to our community!

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We have had nighttime temperatures down to 23 degrees this winter. The large suspended heat plate comes on at 35 degrees and then shuts off when the temperature gets back up to 45 degrees. It gives me confidence the adult hens will be comfortable in freezing temperatures. I think they are happy hens. They did not stop laying this winter and there are no lights in the coop.Hello and welcome to BYC!Glad you joined.
Why would fully feathered adult hens need a heat plate?
I would get a large cardboard box, lay it on its side with the top flap hanging down, bed it with thick dry bedding and put the heat plate in there with the legs up as high as possible so the chicks can fit under it. The box will help to trap the heat. The box or the area it is in will somehow need to be secured so the hens can't access it and the chicks can't get out.
They don't need the heat source.We have had nighttime temperatures down to 23 degrees this winter. The large suspended heat plate comes on at 35 degrees and then shuts off when the temperature gets back up to 45 degrees. It gives me confidence the adult hens will be comfortable in freezing temperatures. I think they are happy hens. They did not stop laying this winter and there are no lights in the coop.