Yikes! Close call!
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I saw an article on that where coop fires are common with heat lamps. I'm glad it went good for you. I'll double check mine before using it if/when I do.
http://www.denverpost.com/ci_24978106/urban-chickens-and-fire-heating-coops-risky-and
Your experience with heat loss and the subsequent stronger survivors bears out what several of my old-time chicken friends have told me--that is NOT to coddle your flock, but let them handle temperature variations without excessive help, only what is reasonable. Sounds like you have a lot of experience and know-how with chickens!
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Hope so since that's what I'm planning with mine. I may keep them locked up in the coop on rainy or snowy days though. That's what I usually do with the silkies.