hi people i need advice my house is suffering from mould, i had cental heating fitted a year ago and the house is 22 years old and only had gas fire and 1 storage heater before than, now i thoght my house would be nice and dry i discoverd behind my sofa is an non joining wall and has mould on it also underneath my sofa and on bottom of sofa and generaly anything wooden on the floor, what is causing this and what can i do, i have windows on lock alot to air the house????