So our 5 week old chicks (6 chicks) have been out in the coop since Monday, and I'm worried that our first real cold snap is now upon them. They are in a horse stall we have converted into a coop inside a large, drafty barn. The horse stall is wooden around the bottom half and then open (with hardware cloth) around the top. I have tried to close up any gaps around the bottom of the stall to stop drafts, but am worried about whether the chicks are going to be warm enough. I have made a huddle area with a cardboard box in the coop and suspended a 250w heat lamp approx 2 feet above, and when I checked earlier the temp there was about 50, and in the coop about 33 (outside was 29). We are dropping to 25 tonight - any ideas how I may improve the warmth of the coop? I'm worried because they are not fully feathered yet - the Sussex are further on than the Marans though. I was wondering about wrapping the upper half of the stall, where there is hardware cloth, with heavy duty clear plastic sheeting, and my other idea was trying to create a plywood hover above the heat lamp. Are these worth doing, any other ideas? One more thought - this is all set up so they can snuggle in their shavings under the heat lamp - at what point will they start needing to transition to a roost, as I think it will be even harder to create warmth on a roost? Oh and any foods worth calorie for calorie more than the chick starter food, as I am sure they are expending a lot of energy on keeping warm rather than growing. Thank you!