Most people think electric heaters are a “clean” and “simple” option for older homes. They are not. Stone and cob walls work differently – they need steady, breathable warmth, not sudden blasts of dry electric heat. Here is what really happens: • Night storage heaters create big temperature swings that pull moisture into the walls. • Portable plug-in heaters only heat the air, not the structure, so damp stays trapped. • As the walls get colder and wetter, mould and condensation follow. • Meanwhi