I use an old mini barn 12x16 for my chicken coop. I have 15 Buff Orphingtons and 10 New Hampshire Reds. Should I put a heat lamp in the coop for the winter months, I live in Indiana and it gets below zero in the winter. I was thinking about hanging a heat lamp over the water to keep it from freezing which would serve as heat for the chickens also. Any advive would be appreciated. This is my first winter with chickens I was also told that you need a light in the coop in the winter or the chicken won't lay as many eggs. Is this true or not?