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Home Blog Why Does External Condensation Appear On My Energy Efficient Windows?

Why Does External Condensation Appear On My Energy Efficient Windows?

Balhousie is always open and honest with its customers and keeps nothing hidden from them.

Triple Glazing

A good example of this is when we tell our window buyers that they may find that external condensation forms on any double or triple glazed energy efficient windows they buy from us.

Some express surprise at this revelation as they wouldn’t expect external condensation to be an issue with brand-new windows, but it can be, most typically in the spring and autumn.

We will then go on to stress to them that it isn’t a bad thing, quite the opposite.

It just shows that the windows are doing what they’re meant to do – offering outstanding heat retention.

They will naturally want to know how and why external condensation occurs, and we supply the answer.

The temperature of the outer glass pane will be lower than the external dew point temperature as no heat can travel through the window unit and get to it.

It cannot be prevented, no matter what you do, but it will only happen now and again, rather than be a regular occurrence.

You either must wait for temperatures to rise outside and the sun to evaporate the droplets, or for a faster solution, wipe the glass down with a towel.  

When you do have a major problem on your hands is when condensation appears between the two internal glass panes of a double or triple glazed window unit as it means that the unit has failed.

We never anticipate this happening with any of our energy efficient windows as they comply with building regulations, and in any case, you’re covered by our 20-year guarantee.

To help educate our customers about condensation, and the causes of it, we have written a Helpful Guide about the subject. Click here to get a FREE downloadable copy of it.


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Balhousie Glazing Limited. Credit is subject to application and affordability. Terms and conditions apply. £1000 minimum order value applies to all finance plans, with a maximum loan value of £50,000. Balhousie Glazing Limited of 11 Feus Road, Perth, Tayside, PH1 2AS Company No. SC148115 is authorised and regulated by the Financial Conduct Authority. Credit provided by Hitachi Personal Finance, a trading style of Hitachi Capital (UK) PLC, authorised and regulated by the Financial Conduct Authority (Register No. 704348).