My Grandad never heated his barn. True, he spent most of his days here in southern Oregon where the weather is more reasonable than other, less hospitable, parts of the country. He had several hay barns and an old milk barn (leftover from his dairy days) and one feed barn that was always available to the livestock. The cattle and horses kinda found their favorite places to go in the coldest weather and sometimes it was in the feed barn but mostly it was out wandering around wherever they wanted to go. I don't remember him ever loosing an animal to the winter weather.
Normal winter climate here is fairly wet, some snow, a week or four below freezing and the occasional week or two below zero.
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