Many of us here do provide heat. I would say we are split on this issue. I don't know the percentages. If we ever did a survey, it would be interesting to see...I did a search, but didn't find anything.So basically, if I understand correctly from you guys - there is no need to worry about any heater in coop - it is all about natural immunity of chickens against cold, sufficient light, and fresh pullets every year (which I don't think I am ready to replace), even in -20, -30C. I get it. So basically those are the reasons not to get an adequate heater - no need?