I would say the only certain explanation would come from a necropcy.
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floor space is about 32 sq ft and the ceiling slopes from 6 ft at front to about 5 feet at back interior height. I had 12 birds. Their door was open today. I'm not sure even a vent could prevent frost in our weather- we just got snow yesterday and today.
They were about 8-10 feet from it. I always buy the pine shavings for their bedding- but I haven't used the coop and compost before. Nothing at all odd about them or their behavior.Do those windows open? If so you need to open one or two to let the wet out.
How far from the heat lamp were your birds huddled on the floor?
What kind of bedding did you put in?
Have you used the stuff you put under it before?
Were any of them breathing oddly? Rattling sound while breathing? Sneezing? Coughing? Nasal discharge?
MaineWhere are you located, sorry if I missed that info.