Condensation is a problem frequently found in all types of properties. It can be unsightly and, if not addressed, cause real damage to wall coverings, window fittings, paintwork and curtains.

The question is how can we reduce condensation without sacrificing the increased comfort that we all desire? It will help to understand the causes of condensation in order to find the answer to it.

What is condensation? Condensation is the result of water vapour in the atmosphere. Warm air will hold more water vapour than cold air. There is a limit to the amount of water vapour it can hold for a given temperature. When saturated air comes into contact with a surface at a temperature lower than its own the air is chilled and sheds the surplus water vapour onto the surface. It will initially appear as a mist but, if excessive, will settle into droplets.

Where does water vapour come from? Two sleeping adults will produce 1.5 pints of moisture in 8 hours! A flueless gas heater will produce up to 2/3 of a pint of moisture per hour! Indoor plants can also contribute but the biggest contributor of water vapour comes from bathing and laundry.

How does effective double glazing help? Double glazing is an insulator which reduces the loss of heat from the inside of the building. Under normal conditions, and assuming the room is heated adequately, the room side surface temperature of the glass will be higher than it would be with single glazed windows or old, ineffective double glazed units. The likelihood of condensation occurring when warm, moist air in the room comes into contact with the surface of the glass is thereby reduced.

It should be remembered that double glazing is an insulator and not a heat source. Neither can it control the amount of water vapour in the air. When rooms are insufficiently heated double glazing cannot fulfil the purpose for which it was installed. However, a pro-active approach to limiting and controlling water vapour in the home alongside adequate heating, controlled ventilation and effective double glazing should bring a noticeable improvement.

For further help or information please give us a call.

Areas we serve

We are based in Swindon, Wiltshire – serving Swindon, Bath, Melksham, Cheltenham, Gloucestershire, Marlborough, Oxford, Reading and Bristol. Additionally, we are also able to serve places within 1 hour radius of Swindon.


Areas we serve

Swindon-based family run double glazing installers

With a head office in Swindon, a short trip from the motorway, we are ideally located to offer our services across Wiltshire, Reading, Bath, Bristol, Marlborough, Berkshire, Gloucestershire, Oxfordshire, and other surrounding locations.

Emerald provide and install home improvements in all materials – uPVC, aluminium and traditional timber. No matter what material you choose, you can be sure we’ll provide you consistent quality – our work is always finished to the highest standards, whether you’re installing 2 windows or 20!

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What our customers are saying

We pride ourselves on the hundreds of customer reviews that we have collected over our many years of trading. Why not read some of our testimonials yourself, and see how our customers have rated their experience with our service.

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Replacing patio door with a window

Emerald windows were brilliant. The patio door was removed and replaced with a window. All work was carried out from bricking up the outside to plastering the inside. Great work...

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Lesley B

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Local Family Friendly Company

We worried about choosing a window company. We looked at all the usual national firms but we preferred the feel of a smaller local family run business as the rep...

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Stephanie C

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Very Pleased

Very pleased with the whole process from Mark letting us see and touch the product in the showroom in Swindon (many don't!), to a transparent price breakdown, no "buy now...

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Casey Collins

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Highly Recommended

Highly recommend Emerald Windows and Doors; new Front and back doors fitted yesterday. Cannot praise Mark the Fitter enough, courteous, friendly and very helpful. Top job with attention to detail...

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Michelle Webb

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Emerald Windows – A Quality Product

Emerald windows have just installed a new composite front door to our property. We are very pleased with the product and the installers were polite, professional and have carried out...

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Richard K

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