Double glazed units expanding and contracting in different weather conditions
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![Double glazed units expanding and contracting in different weather conditions Double glazed units expanding and contracting in different weather conditions](https://londonsashwindows.com/wp-content/uploads/2019/01/Double-glazed-units-expanding-and-contracting-in-different-weather-conditions.jpg)
As you can see when it's colder the glass pulls together, this is because the air inside the unit contracts, conversely if it's warm the air expands forcing the unit outwards.