Hello, we live in northeast Pennsylvania and this will be our first year keeping chickens through the winter. We have 5 chickens that are around 4 months old. I've included a picture of their coop, the front windows are made out of plexi glass and the side is covered with wire and opened up for the summer but we have since boarded that side up to keep the wind and cold out. Is there anything else we should be preparing for? Do they need a heat lamp or other heat source to keep them warm and healthy throughout the winter season? Thanks in advance!