Local Emergency Glazing | How double glazing reduces heat loss

Double glazing uses two panes of glass, which create an pocket of trapped air between them, which in turn helps to insulate your home. This helps to keep the heat in your house and the room warm in the winter, while keeping the heat out of your house in the summer, keeping the room cool.

The thickness of the layer of trapped air tends to vary but it is usually around 20-30mm thick. This layer of trapped air is very important, since the average window pane is only 4mm thick. The window frame has a spacer, which seals the air in the pocket, while any moisture is absorbed by a desiccant.

The window panes have tightly packed molecules, which allows heat to move through them rather quickly. However, the trapped air pocket has molecules which are much wider spread, which makes it difficult for the heat to pass through. That is why the air pocket is so important and acts as such a good insulator.