It's starting to get into the 20's here at night. My husband put up siding on the front of out "chicken house". It's an open 3 stall attached to our garage. He made one side solid, and the othe with a door. The door has a hinged opening we can open or close. The big draw back is it cut out A LOT of light. The girls will go outside through the little hinged door, but I have to open the full door so they will go in. Their egg production is off, probably because of the stress due to change, or the immediate lack of light!??? The big question is should I put a heat lamp in there to 1. Give them warmth at night, and 2. Increase light so they will start laying again? Two of my 6 stopped laying when we put up the door.