terminally badly insulated single-skin stone buildings. With external insulation these can be turned into rather nice .....
AAAAAAAgh cover my beautiful granite walls NO NO NO and there ain't going to be any shiney or black solar wotzits on my slate roof neither. But that is my decision and I don't like the control various distant pen pushers like to excert on my freedom to deface my property if I had no aesthetic sensibilities.
Two ft of granite acts a bit like earth bauming keeping a steady average temperature buffer against the frost. I do plan a bit of internal insulation though and would rather like a windturbine if I can get planning permission, but it would be behind the house and mostly out of sight for the tourists.