We live in New Hampshire (think cold and lots of snow). This is our first winter with our birds. We have 3 Rhode Island Reds, 3 white leghorns, and 4 silkie bantams. My understanding is the RIR and leghorns are quite winter hardy (ability to fluff their feathers and stay warm) but an concerned about the bantams. I was going to stay away from a heat source as I have read it isn't always a good idea (problems if the heat source breaks, and making it so they would always need a heat source) but read an article that the bantams aren't able to fluff their feathers and stay warm and have a much harder time in the winter---so now worried about the fluffy monsters. We have been giving them suet treats as well as corn to help them get ready for winter but am concerned about the silkies. Our coop is fairly weather proofed with lots of hay and shavings. Any suggestions or advice are greatly appreciated.