Cochins are hardy. I never heated when I had my old bldg. Too high of humidity and extreme cold are not a great combination though. I live in Iowa. I have frostbitten combs on males in extreme conditions.Frizzles do not do well in wet conditions but then no Cochin does well in damp conditions. Frizzles are not as well suited for drafts but drafts are bad for all poultry. Ventilation and drafts are not the same thing. Cochins are good moms. Any more questions please ask.