I'm a gardener so I used my cold frame and it is working perfectly. It's still too cold to put plants out so it's dual purpose.
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Here it is in use when the baby chicks arrived on Monday 2/6/12
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And this is on Friday, chicks were 1 week old 2/10/12.
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I've decided to put them in the chicken house this weekend. I've set up a space with a heat lamp. Our February weather is so warm this year I'm not going to keep them in the house until March as I had originally planned.