Maybe I'm going about it all wrong, but we have already built a brand new, 4'x8' coop. I temporarily partitioned off half of it, hung the heat lamp, layed down the shavings, got the food and water out there, and moved in the new tenants. They are 2 1/2 weeks old. Heat light stays on each night, even though the temps only drop to the 50's and 60's, but it goes off durning the day.
The coop is locked up tighter than a prison. We have had some amazingly warm weather here in Oklahoma, so my wife has been opening the pop door up when the temp warms up each day. They LOVE it!! They run up and down the temporary ramp going from the run to the coop. They definately know where "home" is. When someone comes around the corner, and they get a little startled, they haul tail feathers up the ramp and inside the coop. Then, immediately run right back out.