I have 12 chicks in my livingroom. They are outgrowing their triplex brooder. They are also starting to really smell lol. I would use a heat lamp. I might even use two at night. Our night temps are in the thirties, daytime temps are high 40's to 60's depending at least for next 10 days. They don't use heat lamp anymore in the house. The coop is all wood and the front run is closed in except for the door to keep out wind. I removed third floor for pics.