If one wall is cold
We had one wall in our bedroom when we lived in Atlanta that just radiated cold in the winter. As we also had noise from the Heat Pump compressor on the other side of the wall we fired out and added another layer of insulation (make sure to take out the old and replace total as I was told if you sandwich the foil in the middle it's a problem) It made it quiet and much much warmer. It means a mess and drywall and paint too but it solved the problem on the north side of the house.
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