All houses lose heat through their doors and windows. It’s a natural thing. But double glazing keeps your home warmer – as well as reducing your energy bills. The costs and savings will be different for every home, depending on its size and the quality of the double glazing. It’s expected that on a standard house, you can save approximately $200-250 per year, with double glazing.

Let’s put this into context. Say your double glazing lasts you 20 years (although it should last a lot longer), and you’re saving $250 a year. That means you’ll save $5,000 on electricity, over the course of its lifetime.

Energy efficient double glazed windows work like this. There are two sheets of glass with a gap in between, typically about 16mm. This creates a barrier that keeps heat in.

Energy efficient windows are available in a number of styles and materials. Performance is judged on the following:

  • How well they prevent heat passing through the windows
  • How much light moves through the glass; and
  • How little air escapes in or out, around the window.

It’s the glass, the spacers and the gaps between the sheets of glass that are important. Low emissivity (Low-E) glass is the most energy efficient choice for double glazing. It lets the light and heat in, but reduces the level of heat that can get out. And the pane spacers containing little or no metal are the best option for efficiency.