I bought a trio of young Seramas at the La Rue auction in June. I chatted with the lady who raised them for a short time. I was wondering just what I need to do to keep them through the harsh winters we have here in N.W. Ohio. I am only familiar with cold weather hearty birds. I really like these little guys and hate to part with them but I am clueless of what to do. My coop is not heated.