I have 15 hens and 1 rooster, 4 guinea hens, (and wild turkeys) in S NY, and I love all my birds.
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It's best to have your coop in full sun or as close as possible, It should be secure from predators, locked up tight at night. Mine is about 16" off the ground so when it's nasty out they can hang out under the coop and out of the elements (this helps alot when theirs snow on the ground)
Your coop will have to have a good amount of ventilation, I left my roof rafters open but with hardware wire on it to keep animals out, I also have 1 16"-30" window as well as 2 10"-14" vents. If I ever get the time I want to cut a copula in as well.
Make the layer boxes in the shade, Outside access is nice, My roof over the boxes is hinged to allow acess.
Make your perch(s) out of sassafras if possible, bugs hate something about that wood.
My coop is heavily insulated although its not necessary in my environment
I keep one of my waters on top of a 2'by2' chunck of black marble which helps the water not freeze, but I still have to dump the ice dayly in the coldest parts of winter, I also have a heat pad under another water in the coop, Its a homemade one made out of pipefreeze heating cables with a 'thermocube' thermometer (15$) works great.
Good Luck