Dehumidifier in bathroom

[Graciescotland]

House is old, 200 years, 2 foot stone walls, Im having some modern internal insulation done and I reckon Its going to force me into installing some form of extractor or dehumidifier, up till now natural draughts have been taking care of things. Can anyone recommend a brand of dehumidifier rather than drilling a great big hole through the wall

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