Hello. We live in Northern Nevada at 6200 feet. Winter can get down to around 10 degrees with occasional snow. We have a small cedar coop (ordered off of Amazon for around $275) and two chickens we adopted from our local feed store. We are new to this. We have hay on top of the soil ground for flooring and hay inside of the nestsAt night the chickens are closed into the top of the coop where they have a roosting area and a nesting box that is separated into two boxes with a partition. Can you advise us on how to keep the coop warmer? How would I go about insulating their sleeping area? And perhaps even their open area? At night right now it gets down to about 53. We bought a heat lamp but it sends the temperature soaring. Any advice would be wonderful.