I just wanted to clarify on my previous post. I am planning to build the solar heater for my house. I don't heat my coop ever. IMO the birds are much better off being acclimated to the natural temp. The only time my birds hide in the coop is during really nasty storms or, in the case of last winter, when we had a couple feet of snow on the ground. TBH a few of them even went out in the snow. But after one of them got stuck in a snowdrift I locked them inside for their own safety. Fortunately I found her in time. Poor girl was icy cold, but I was able to bring her inside and get her warmed up.
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