How Double Glazing Works

Double glazing uses two panes of glass separated by a layer of argon gas to keep your home more energy efficient. The argon gas is a poor heat conductor and therefore keeps warm air from escaping, while the second pane of glass acts as a barrier to noise.

Energy Efficiency

Energy efficiency is a hot topic for homeowners for two reasons: energy efficient home improvements can reduce household bills and increase house value, and they will also reduce your carbon footprint.

Double glazed windows are one of the top property improvements chosen by homeowners, because they keep homes at a warmer temperature. Double glazing also reduces outside noise which is another added benefit. But how is this type of window so much more efficient than a single pane window?

Double glazing works in three ways:

  • It prevents heat loss through the window
  • It stops draughts through the window and the frame
  • It works as an insulator in the same way as cavity wall insulation

Why the extra pane of glass?

Double glazed windows have two panes of glass close together, hence the name double glazing. There is a glass pane on the outside, a glass pane on the inside, and a small space in the centre known as an air gap or tight air pocket filled with insulating gas.

When heat energy is transferred from hot spaces to cold spaces we call it convection, but it requires a good conductor. The trapped air in-between the glass cannot circulate, so it is therefore a poor conductor, reducing the rate of heat loss from inside the house. With less heat able to leave the room through the window pane, the room stays warmer for longer.

Most double glazed windows in New Zealand are manufactured with aluminium frames, which is both durable and an efficient material. There should be no small gaps around the window frames to allow cold air to enter the house.

Reduce your energy bills and increase security

By adding an extra piece of glass to your windows, you can vastly reduce heat loss and reduce the annual cost of your energy bill. Double glazed windows have a heap of other advantages too – for example two panes are much more difficult to smash than one, so they can further increase home security. They will add value to your home if you upgrade from single pane to double glazed windows, as they will increase the overall energy efficiency of the property.

Want to know more? Give our sales team a call with your questions or send us an email.