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Yes they were cold in winter, I used to live in one when I was young before they got pulled down out our way. If I say we had those lovely frost patterns on the INSIDE of metal framed single glazed windows it should give you an idea of how just how cold they could get. This was before modern central heating was really a thing though. It was the old boiler behind the fireplace job which always burnt itself out middle of the night, nice and snug in living room etc but pretty pointless at night lol.