here is what exoticchickenautcions has to say about the Hedemora chickens. They are as far as I am aware all of greenfire farms, however there are a few other sources for birds and eggs.
Hedemora are possibly the most cold hardy chickens in the world. Their combs and wattles have evloved to a reduced size, minimizing the ravages of frostbite to their extremities, and the skin that is visible is often black to absorb the weak rays of the northern sun. But, their most striking adaptation is the layer of soft down that is extraordinarily effective as insulation.
Experts in Sweden have told us that if these chickens are well fed they can routinely free-range in the snow at temperatures of -5°F and the hens will continue laying eggs so long as temperatures exceed 5°F. Conversely, hedemora do not adapt well to hot climates, and they have been known to die of heat stroke during particularly hot days in southern Sweden. If you live in a hot climate be prepared to artificially cool the birds during the summer if you feel you must have this breed of chicken. We recommend hardiness zones 2-4, perhaps 5.
Hedemora exhibit feather colors that are so exotic and unique that they are hard to classify. Shades of champagne, salmon, violet, and yellow are often encountered, and the patterns of these colors can be solid, shaded, or laced.
I am hoping to get eggs shipped out to me from berrytanglefarms. It is a logistic issue right now, as where I live the shipping is delayed often and is always beat up. I will figure this situation out, and have these eggs in for the easter hatchalong. Hopefully things go well, if not I may try for getting a chick sent out.