So many pages to read, not sure I have the time just yet..... a big "howdy" to all the new Colorado thread peeps!!!!!
I too live where it can get really cold, so coop is well insulated, and of course no drafts. I don't use heat in the winter, just LOTS of bedding, and they all hunker down together, so far, so good!
As to the late bloomers on laying their first eggs, look at it this way, they will lay for longer, so no worries, you will still get the same amount of eggs!! LOL
Wendel happy belated birthday to Beth!!!!!!