Now that autumn is in full swing we’re all noticing a drop in the temperature. Colder days mean warmer clothing and, just as our wardrobes change to make way for cosy knits, you may notice your home changing too. More specifically, your windows.

It’s common to notice some condensation on the outside of your double-glazed windows at this time of year, especially first thing in the morning as the air outside settles on a cold surface.

Condensation on the outside actually means your double-glazed unit is working properly. It’s when you notice condensation and misting between the panes of glass that there could be a problem.

In this article, we’re going to look at some of the common causes of mist in double-glazed windows, how to fix it, and the benefits of replacing your window seals.

Causes of mist in double-glazed windows

When you notice condensation on your windows it can be hard to work out where it’s located. If you’re unsure, it’s worth consulting a professional who will be able to advise you on how to work out where the misting is located. Alternatively, they could visit your home to check all is well with your window installations.

Cleaning your windows regularly will also help you to keep an eye on the condition of your windows and spot any weaknesses in the frame or glass.

Some common causes of this mist are:


In a room with poor airflow, you’re likely to notice a build-up of condensation on your windows. Make sure to open your windows at regular intervals throughout the day to allow air to circulate.

Curtains and nets

Curtains and nets can improve energy efficiency in your home however if they sit very close to the window they can cause a build-up of moisture. Keep a generous gap between them and the surface of the window.

Bathroom doors

After you take a bath or shower keep the bathroom door closed to stop steam from travelling onto windows in the next room. This can cause condensation on the windows.

Drying clothes

In the colder months, it’s harder to dry clothes on the washing line. So of course, you dry your clothes on an airer inside. What this does though is create a lot of condensation on your windows, particularly if you’re drying them on a radiator, as the water droplets find their way to your windows. Try to make the most of sunny days!

Benefits of replacing window seals

Depending on the age of your UPVC windows, it may be worth replacing your window seals if condensation is a problem. If your windows are fairly new they will be covered by a warranty however, if not, you should consult a professional.

The benefits of replacing your window seals include:

  • improved energy efficiency in your home
  • a boost to the value of your property
  • a better view from your windows – no more misting!

Expert help and advice

We hope that you’ve found this article useful and please do contact us with any questions, or to arrange a consultation about misting on your windows.

Cosyhomes Windows is here to advise you on the best option for your home. Don’t hesitate to get in touch with us.