It might depend on how many chicks you have. Mine are two-three weeks old, have wing/tail feathers. I put them out two days ago. No heat lamp, and about 78 degrees. I think they are healthier with more space to run in and fresh air. They do have shade, and a box to get into. I made a nest out of hay, and at night they are all in there together, no heat lamp. there is a dozen chicks.
Last night we had a big heavy rain and it got pretty cool, when I went down to check at daylight, they were still in the nest, but dry, no losses.
Last night we had a big heavy rain and it got pretty cool, when I went down to check at daylight, they were still in the nest, but dry, no losses.