Led by a team at the University of Exeter Medical School, the research has found that a failure by residents to heat and ventilate retrofitted properties could lead to more people developing the respiratory condition.     

Working with leading UK social housing provider, Coastline Housing, the research team assessed data from the residents of 700 properties in Cornwall.

They found that people living in more energy efficient homes had a greater risk of asthma, and that the presence of mould doubled this risk.

The study, published in the journal Environment International, builds on previous work showing that dampness and mould can increase the risk of allergic diseases.     

It is the first time scientists have been able to combine detailed asset management data with information about occupant behaviour and health, to assess the factors likely to contribute to asthma.

"We've found that adults living in energy efficient social housing may have an increased risk of asthma. Modern efficiency measures are vital to help curb energy use, and typically prevent heat loss through improved insulation and crack sealing," researcher Richard Sharpe said.

"Yet some people, particularly those living in fuel poverty, are unlikely to heat a building enough – or ventilate it sufficiently – to prevent the presence of damp and mould, factors that we know can contribute to asthma," said Sharpe.     

The presence of mould was unable to fully explain the study's findings however, with poorly ventilated homes also likely to increase people's exposure to other biological, chemical and physical contaminants, researchers said.     

The study pointed to other possible factors which can affect health in homes with high humidity, such as house dust mites and bacteria.

Occupant behaviours often vary dramatically in different properties, with some people drying washing indoors or relying on older and less effective heating systems.

These behaviours can increase the indoor humidity at a property, a problem which is sometimes worsened by energy efficient efforts to seal cracks and gaps.

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