Energy Efficient Windows in Australia: What Homeowners Need to Know
Energy efficient windows in Australia have moved from a premium option to a practical necessity as energy costs rise and building performance standards become more demanding. Windows account for a significant proportion of a home’s heat loss and heat gain, and upgrading to a high-performance product delivers measurable improvements in comfort and running costs across every season. This guide covers what energy efficiency in windows actually means, how Australian standards measure it, and what to look for when choosing a product.
How Windows Affect Home Energy Performance
Windows are one of the weakest points in a home’s thermal envelope. Single-glazed windows and older aluminium-framed double glazed units allow heat to transfer between indoors and outdoors far more readily than insulated walls and ceilings. The result is a home that is harder to keep comfortable and more expensive to heat and cool.
Energy efficient windows in Australia address this through a combination of improved glazing and better frame performance. The key mechanisms are the following:
- Insulating glazing gap: Two or three panes of glass separated by air or inert gas slow the transfer of heat in both directions.
- Low-conductivity frames: uPVC frames have a much lower thermal conductivity than aluminium, which means the frame itself contributes to insulation rather than creating a thermal bridge.
- Airtight sealing: Multi-point locking systems that compress seals evenly around the frame eliminate air infiltration, which is a significant source of energy loss in poorly sealed windows.
- Solar control glass options: Certain glass types can be specified to reduce solar heat gain in summer while still allowing natural light, which is particularly relevant in hotter Australian climates.
How Australian Standards Measure Window Energy Performance
Two main frameworks are relevant when evaluating energy efficient windows in Australia.
WERS Ratings
The Window Energy Rating Scheme provides independently verified performance ratings for windows across three key metrics: thermal transmittance (U-value), solar heat gain coefficient, and air infiltration. Products rated through WERS give homeowners a reliable and standardised basis for comparing the energy performance of different windows. Astellite holds WERS accreditation across its product range.
NatHERS and the 7-Star Standard
The Nationwide House Energy Rating Scheme requires new homes to achieve a minimum energy rating. The 2022 National Construction Code raised this requirement to 7 stars for new residential builds. Windows play a direct role in achieving NatHERS ratings, and choosing high-performance double or triple glazed uPVC windows is one of the most effective ways to contribute to a compliant rating.
What Astellite Offers
Astellite manufactures energy efficient windows across a full range of styles using German-engineered Aluplast uPVC profiles and high-performance Lightbridge double glazing. Every window is custom made to your home’s exact dimensions and installed by Astellite’s own team. The range includes tilt and turn windows, awning windows, sliding windows, bifold windows, fixed windows, bay windows, corner windows, and custom windows.
Astellite holds accreditation from AGWA and WERS, and all products meet Australian building and safety standards including bushfire compliance where applicable. Every installation is backed by a 10-year warranty. The team services homes in Melbourne, Geelong, Melton, and the Mornington Peninsula.
Get a Free Quote Today
If you are ready to upgrade to energy efficient windows in Australia for your home, Astellite offers a free, no-obligation measure and quote. Contact us today to arrange your assessment and get started.