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Respected weatherman John Kettley is launching the 'UK Condensation Index' to help people better protect their homes and save on heating bills.

With the autumn and winter months ahead, the index, which is available on www.condensationindex.co.uk, will highlight the effects temperature, wind and approaching weather fronts have on indoor and outdoor environments.

It will combine these factors and provide a figure indicating how likely it will that moisture released from the air - commonly known as condensation - will appear.

Condensation is normally associated with water droplets forming inside, on windows or walls or outside on cars. However, it is unseen condensation that causes the most problems. Condensation can penetrate walls and other unnoticeable areas causing structural and cosmetic defects. The best way to beat these problems is to control excess moisture in the home - and information and preparation plays a big part in this.

Good ventilation can remove excess moisture on a dry day, but during the winter months, the temperature and air humidity is likely to work against using this method to combat excess moisture - in fact, opening windows will only lead to raised heating costs.

John Kettley said "I hope this index will serve to warn people of periods of high condensation, and help them better prepare for the conditions. It is important to understand the concept of condensation and what to do to negate the effects it has on our homes and comfort.

"Working out how to deal with high condensation days will help to lower many heating bills and prevent unnecessary damage to homes and furnishings. Many people believe ventilation is sufficient to stop condensation or prevent mould growth or damp spots appearing.

As the index's historical data shows, the average winter day scores quite a high rating, around 8, which in effect means ventilation is more likely to draw in more moisture than it manages to remove."

Using a scale of 1-10, the index will help people see how the weather changes and how moisture levels fluctuate. It will go some way to explain why some days feel raw (high on index) or clear and dry (low on index). Condensation, moisture, plays a big part in how the weather affects people. Moisture serves to accentuate the air temperature to its extremes - i.e. it makes cold air feel colder and warm air warmer.

In practice a high-scoring day (7-10) would feel colder than a low-scoring day even if the temperatures are the same. This means the index can also help people choose the right clothes to wear for the day without just relying on the temperature level on the weather forecast!

John added: "On a day with high condensation levels, most people compensate for the rawness of the air by simply raising the temperature in their homes, which means increased heating costs. A high condensation index figure means ventilation is futile and people should look to other ways to get rid of excess moisture in their homes."

The UK Condensation Index is supported by Ebac Group Ltd, the UK based humidity specialist. Air conditioning expert John Elliott MBE DL says: "The condensation index will help householders better manage moisture issues and heating costs in their homes. We know from talking to our customers that to be pre-warned is to be pre-armed, and there is no use switching on your dehumidifier the moment, or after, condensation occurs."

Note to editors

The UK Condensation Index is copyright of Ebac Group Ltd. The index with accompanying notes and weather forecast are available for publication, to obtain the rights, please contact harry.lovell@ebac.com, or call +44(0)1388 605 061.

The index will combine factors such as temperature, dew point, winds and changes in these conditions to indicate the likelihood of condensation appearing. The index will use the situation at five geographical reference points at 12 noon, up to five days in advance. The reference points are London, Bristol, Birmingham, Liverpool and Glasgow.

The index is scaled from 1 - 10, where '1' will indicate a clear day, where the horizon is visible (ventilation works ok to get rid of indoor moisture, but homeowners should beware of energy losses), while '10' means fog (for homeowners ventilation would do more harm than good, a dehumidifier should be turned on full).

The index will be updated daily, with the accompanying 16-day weather forecast updated weekly, on Wednesdays. All information is available on www.condensationindex.co.uk.

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