Quality and Energy Efficiency

What sets us apart is our commitment to delivering quality products at competitive prices. We understand the importance of energy efficiency in today’s homes, which is why our focus is on high-performance, energy-efficient solutions.

Our thermally broken aluminium profiles with double glazed windows not only meet the rigorous Australian standards but also contribute to the nation’s energy-saving goals.

By choosing JL Windows and Doors, homeowners not only invest in quality but also enjoy significant savings on their energy bills.

Understand “U-value” and “SHGC”

U-Value (Thermal Transmittance):

  • Definition: The U-value, also known as thermal transmittance, measures the rate of heat transfer through a window or other building envelope components. It is expressed in units of watts per square meter-kelvin (W/m²K).
  • Interpretation: A lower U-value indicates better insulation properties, meaning the window is more effective at preventing heat transfer between the interior and exterior of a building. This is particularly important in maintaining a comfortable indoor temperature and reducing energy consumption for heating or cooling.

SHGC (Solar Heat Gain Coefficient):

  • Definition: The SHGC measures the fraction of solar radiation admitted through a window and released into a building. It is expressed as a number between 0 and 1.
  • Interpretation: A lower SHGC indicates that the window allows less solar heat to pass through, making it more effective at blocking unwanted heat gain. However, in colder climates, a higher SHGC may be desirable to allow for passive solar heating during the winter months.

In summary, when evaluating windows for thermal performance:

  • U-Value: Look for a lower U-value to ensure better insulation and reduced heat transfer.
  • SHGC: Consider the climate and purpose of the window. In warmer climates, a lower SHGC may be preferred to minimize heat gain, while in colder climates, a balance may be struck to allow for beneficial solar heat gain.

These metrics play a crucial role in selecting energy-efficient windows that contribute to overall building performance and sustainability. When discussing window specifications or selecting windows for a project, it’s important to consider both U-value and SHGC in order to achieve the desired balance of insulation and solar heat gain.