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They won't freeze. If these are local, adult birds they must already be used to the changes in temperatures in your area. They do need good ventilation to avoid frostbite though, which is often lacking in small prefabs. Or can you wait to take these new birds until after this cold spell is...

20F? Not -20? You absolutely do not need heat at 20F unless you're talking about young chicks, and you said these are laying hens.