Achieving Energy Efficiency in Mild Climates
Climate Zones in NSW and SA
Most regions of NSW and SA are considered warm temperate climates, requiring a balance between reducing heating loads in winter and cooling loads in summer. For these climate zones it is important that your windows and doors have both a low U value (for better insulation) and a low Solar Heat Gain Co-efficient (SHGC), to prevent the heat from the sun entering your house.
Sydney and surrounds, including Wollongong, Hunter and Port Macquarie regions and coastal areas of SA encompassing Ceduna and Adelaide and some hinterland areas north of Whyalla and east of Adelaide are classified as climate zone 5. Inland NSW and SA fall into climate zone 4.
For Northern NSW, the region above Port Macquarie from the coast to the border of QLD (Climate zone 2), please refer to our Window and Door Specification for 7-Stars - QLD guide. For the ACT, and SA/NSW Alpine regions (Climate zone 6, 7 and 8), please refer to our Window and Door Specification for 7-Stars - VIC and ACT guide.
Options for improving your Energy Efficiency through glass
To make your selection easier, we've created a good, better, and best glass offer for the NSW and SA climate zones, with tiered performance levels. While performance will be a major consideration in deciding which glass to use, other factors such as cost, window colour, availability, and lead times may also play a role. There are many other options available to meet a variety of needs; please contact your Trend representative for more information.
Energy Ratings
In addition to good design and orientation, the products and glazing we recommend below will assist in achieving 7-stars for your building.
Synergy Awning Window
| WERS Code | Option | Glass Type | U Value | SHGC |
| TND-002-007 | Standard | Clear Single | 6.4 | 0.63 |
| TND-002-008 | Good | Neutral Low E Single | 4.9 | 0.41 |
| TND-002-015 | Better | Clear IGU | 4.1 | 0.57 |
| TND-002-019 | Best | Low E Clear IGU | 3.3 | 0.45 |
Synergy Sliding Window
| WERS Code | Option | Glass Type | U Value | SHGC |
| TND-001-007 | Standard | Clear Single | 6.5 | 0.69 |
| TND-001-008 | Good | Neutral Low E Single | 4.7 | 0.45 |
| TND-001-015 | Better | Clear IGU | 4.2 | 0.58 |
| TND-001-021 | Best | Low E Clear IGU | 3.2 | 0.46 |
Synergy Sliding Door
| WERS Code | Option | Glass Type | U Value | SHGC |
| TND-017-005 | Standard | Clear Single | 6.3 | 0.71 |
| TND-017-025 | Good | Low E Neutral Single | 4.6 | 0.45 |
| TND-017-009 | Better | Clear IGU | 3.8 | 0.63 |
| TND-017-013 | Best | Low E Clear IGU | 2.9 | 0.48 |
ThermaRes Awning Window
| WERS Code | Option | Glass Type | U Value | SHGC |
| TND-102-001 | Better | Clear IGU | 3 | 0.55 |
| TND-102-021 | Best | Low E Clear IGU | 2.2 | 0.42 |
ThermaRes thermally broken products are only available in Double Glazing, therefore the “Standard” option has been omitted, and the “Good” option has been substituted for Clear IGU.
ThermaRes Sliding Window
| WERS Code | Option | Glass Type | U Value | SHGC |
| TND-104-001 | Better | Clear IGU | 3.2 | 0.65 |
| TND-104-022 | Best | Low E Clear IGU | 2.3 | 0.50 |
ThermaRes thermally broken products are only available in Double Glazing, therefore the “Standard” option has been omitted, and the “Good” option has been substituted for Clear IGU.
ThermaRes Sliding Door
| WERS Code | Option | Glass Type | U Value | SHGC |
| TND-108-001 | Better | Clear IGU | 2.8 | 0.64 |
| TND-108-042 | Best | Low E Clear IGU | 1.9 | 0.50 |
ThermaRes thermally broken products are only available in Double Glazing, therefore the “Standard” option has been omitted, and the “Good” option has been substituted for Clear IGU.
ACHIEVING ENERGY EFFICIENCY IN NSW and SA
Window and Door Specification for 7-stars
Download our window and door specification guide for NSW and SA which includes the glass options for improving your energy efficiency to meet the 7-star requirements, as well as a cheat sheet of WERS values to make product selection easy.
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