1 home in 5 has repeated mildew problems and in 1 home in 7, condensation leads to damp wall linings. Mould, mildew, condensation and dampness mainly occur during winter months. Check that the roof, cladding, guttering and storm-water system are in good repair. An empty house, provided it is weather tight does not grow mould and mildew. It is the people living in the house that cause the conditions that lead to mould and mildew growth just by carrying out their everyday household tasks.
Moisture builds up in the air and condenses wherever the surfaces are cold.
An un-flued gas heater produces up to 1 litre of condensation an hour, on its highest setting. Consider using a flued gas heater or electric, etc. Breathing 1 litre per person Per day. Plants Maintenance Repair leaking plumbing a.s.a.p. On average 3 litres are produced per day.