Double glazing is created by sealing two panes of glass together, with a gap left between them, to form a double glazed unit. The air held inside the window, creates an insulating barrier that keeps heat in.

If the the seal on the glass should break (or fails, as its known in the industry), condensation can get into the unit which causes a misted up window. The seal can break for a number of reasons, but is mainly due to the age of the window (seals don’t last forever), how it was manufactured or even how it was fitted in the first place.

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This is not a fault with your window or with the glazed unit failing, as outlined above.

In Scotland, we’ll usually see this happening in Autumn or Spring. This is because the temperature of the glass drops to a low level overnight, with the moisture of the morning’s heavy dew condensing on the cold surface of the glass.

You’ll often see this happening more with newer windows, and Low E glass, as the windows fitted nowadays are far more efficient than those fitted a few years ago.

However, there is no need change the glass or think about replacing the window, as this is just down to Scottish weather and actually shows that your windows are working correctly.