I have two rooms that seem to suffer badly from condensation. On cold
mornings the Windows are covered in condensation and over a period of time
the painted walls start to turn black. Is there anything I can do to cure
this? Is there are special paint that I can paint onto the outside or inside
walls to stop the walls from turning this colour. One room used to have a
fireplace but I have now blocked this up. The other room a bed is up against
the wall that shows signs of condensation. Any ideas would be appreciated.

Thanks