Condensation, with the associated problems of mould growth, streaming windows and musty smells is generally a feature of badly ventilated homes.  In recent years as properties have become more sealed due to double glazing, draught proofing etc., the problem has increased.  The use of such measures in today's homes means that the natural ventilation has been lost and air flow being significantly reduced to create a sealed environment.  Under these conditions water vapour is trapped within the building, stagnant air pockets occur behind furniture and condensation will form on cold or prone surfaces.

Condensation is caused by the build up of moisture in the air inside the home, which is generated by the occupants going about their usual domestic activities, cooking, bathing etc.

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Every day the average household produces 12 to 15 litres of moisture into the internal environment through normal domestic activities and just breathing. Warm, moist air is highly mobile and will move throughout the internal area of the building resulting in condensation when in contact with colder areas.  In poorly heated or badly ventilated dwellings condensation can be extremely severe and will invariably lead to widespread mould growth, windows dripping with condensation, water pooling on cills, damp curtains, mildew on clothing and musty smells.  Mould growth can cause severe disfigurement and damage to surfaces it is in contact with.  Extended contact with mould can cause spoiling to painted and prepared surfaces.

Dust mites, which have been associated with asthma and rhinitis thrive in damp conditions.  Long term exposure associated with the presence of mould gives rise to serious concerns to the risk of adverse health problems.  The young, the old, asthmatics or those suffering from respiratory problems are particularly at risk.  Generally speaking, living in a cold and damp dwelling is detrimental to a healthy wellbeing.