Quote:
As to their feet keeping warm, check for yourself. I did, and I found that my girls' feet were VERY warm. When they roost them rest down on their feet so their feet are covered with their fluff and belly feathers which are very downy and VERY warm. Just go to your coop on a cold night and slide your hand up under their belly so you can feel their feet and you'll see what I mean.
As to their origins being tropical/sub-tropical, you are correct, but you must also take into consideration the breeding that has taken place. For instance, I have Plymouth Rocks and Rhodies, both of which are New England breeds bred for the harsh New England climate. My girls love the cool weather. On the other hand lots of silkies, Welsummers, Sumatra etc. are bred to handle warm weather better.