We have a one-legged chicken that's we've been caring for since last spring. At night she can't be with the other chickens as she can't perch and the others peck her. She's a bantam, so we've been putting her in a large rabbit cage at night. Now that it's cold (we're in southern NH) my husband built an insulated box with a swinging front to keep her in. We put it on the porch, and I've been sticking a couple of those plastic pet warmer discs in the coop with her. I can microwave the discs and they stay warm for about 10 hours. Yesterday morning when I opened the box the poor bird was shivering - the discs hadn't stayed warm. We live in an old house without any exterior electrical outlets so can't put a kennel pad in there. Does anyone have suggestions? She can't come in the house - her behavior is exemplary, but her bedding is messy and she smells, which everyone objects to (she was in the house for a little bit last spring). Thanks and best wishes, Cara, Milford NH.