I should add, they are 3 weeks old now, and I've already moved them into the coop. They are well feathered and seem very hardy.
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Thank you for your reply.I've brooded outside with heating plates twice now.
The first time I did it much like you did, inside for two weeks, then in an outside brooder with the heating plate. It worked out fine, but setting up two brooders, and having chicks in the house wasn't ideal.
The second time, I put them in an outside brooder with a heating plate on day 1. The brooder was an old rabbit hutch that we insulated around 3 sides, and then I loosely draped a towel over the front at night to keep out drafts. I was paranoid, so I also put a cozy-coop heating plate along one side, in addition to the brooding plate. Temps were down into the lows 40s that first night. When I went out to check there were the chicken at first light, and there they were bouncing happily around.
Having done it both ways, I wouldn't go back to inside brooding again. Either way, I recommend putting a pan of dirt/clump of sod from your yard with them from the beginning.
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Here's a link to an article discussing the add-a-clump of grass idea. Make sure you also put some chick grit in the brooder at the same time.
http://naturalchickenkeeping.blogspot.com/2013/04/why-putting-sod-in-your-brooder-will.html
Since there were no clumps of grass left in my chickens yard, I went with plain dirt -- although I did put in a clump of weeds (of a kind that I know my chickens like to eat), after a few days and they pretty much stripped it bare.