Off the top of my head I'd have to say that the floor of the coop was too wet... LOL Has your friend thought of the Deep Litter Method? I don't have any supplemental heat in my coop - I even leave the pop door open since they stay in the run and don't free roam. Most of the old timer's that I've talked to said as long as their coop is relatively "wind tight" the chickens will be fine...
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