One night I accidentally locked my naked necks out of their coop (have to kick 'em out when I clean it, they enthusiastically try to "help" and get in the way) it was down near 0 degrees during the night, they were perfectly fine in the morning, went right into their coop and laid their eggs, so they need no additional heat despite the naked neck, I have also had naked necks in over 120 degree heat and it was no problem at all for them, as long as they have water available. Also, they are a large bird but don't seem to eat as much as the other large breeds do. This is also the only breed I've noted to be easy to herd where you need them, or to follow me around dog-like. They consistently lay when all my other breeds stop for the winter, and they seek attention. If I could get blue, green and chocolate colored eggs from them, I'd never keep any other breed.
I have several NNs that lay green eggs, from mint to olive to pale aqua.
