How Low-E Glass is Transforming Sustainable and Energy Efficient Design

Sustainable design is no longer a ‘nice-to-have’ in Australian design and construction. It’s a fundamental requirement to stay compliant under the National Construction Code (NCC), driven by the urgent need to address environmental challenges through creating functional, energy-efficient spaces made with sustainable building materials.

Low-emissivity (low-E) glass is becoming a secret weapon in sustainability, with cutting-edge advancements that improve energy efficiency and the comfort of inhabitants through high-performance windows like those manufactured by Thermotek.

From new residential homes to major renovations and retrofits, this advanced glazing technology is changing the way architects, interior designers, builders and homeowners approach sustainable windows and eco-friendly building practices.

What is Low-Emissivity (Low-E) Glass?

Low emissivity (low-E) glass is a type of glass that features a microscopically thin, transparent coating designed to reflect infrared energy (solar heat) while allowing visible light to pass through.

This unique capability helps reduce heat transfer, making it a game-changer for sustainable design and solar control.

Thermotek uses low-emissivity coatings on our glass panes to enhance insulation and energy efficiency. These coatings are applied to the glass to repel radiant heat from the interior while allowing natural light to enter. 

Used in both our double- and triple-glazing systems, Low-E coatings work seamlessly with our uPVC frames and precision sealing to enhance thermal performance and insulate indoor spaces. The additional glass panes and argon gas fill provide even greater insulation, significantly reducing energy loss and drafts.

There are two terms worth knowing that can help you determine how effectively Low-E glazing helps maintain a comfortable indoor climate year-round.

Solar Heat Gain Coefficient (SHGC) measures how much solar heat passes through your windows. A lower SHGC helps keep your home cooler in summer by blocking excess heat, while a higher SHGC allows more warmth in — ideal for capturing passive solar energy in winter.

Meanwhile, U-Value indicates how well the entire window unit, including the glass and frame, retains or resists heat transfer. A lower U-Value improves insulation, keeping warmth inside during winter and unwanted heat out in summer.

How Are Low-E Coatings Applied?

Low-E coatings come in two main types:

Hard-Coat Low-E Glass: Applied during the glass manufacturing process, this durable option is suitable for single-pane windows but offers only moderate energy efficiency.Soft-Coat Low-E Glass: Applied after the glass is formed, soft-coat low-E glass provides superior energy performance, making it a preferred choice for double- or triple-glazed units, such as the ones that Thermotek offers.

Benefits of Using Low-E Glass

Improves thermal efficiency with reduced energy costs

Low-E coated glass minimises heat loss in winter and prevents excess solar gain in summer. This reduces reliance on artificial heating, and brings down  heating and cooling costs.

Enhances Indoor Comfort

By regulating indoor temperatures, low-E glass helps maintain a comfortable living or working environment year-round. It allows natural light to brighten a space without compromising insulation, preventing overheating in summer and retaining warmth in winter.

Blocks UV Rays

Low-E glass significantly reduces the amount of ultraviolet (UV) radiation that passes through windows. This protects occupants from prolonged UV exposure while preventing furniture, flooring, and wooden surfaces from fading or deteriorating over time.

Supports Energy Efficiency in Modular and Prefabricated Construction

Low-E glass is an ideal choice for modular and prefabricated homes, where sustainability and efficiency are key priorities. These structures benefit from its superior insulation properties, which help maintain stable indoor temperatures.

Complies with Australian Energy Efficiency Standards

As energy efficiency regulations tighten, low-E glass helps architects, designers, and builders meet compliance requirements. A change in NCC which came into effect in May 2023, all new residences must achieve a 7-star NatHERS energy rating, along with a Whole of Home efficiency rating of no less than 60.

Misconceptions About Low Emissivity Glass

Despite its benefits, low-emissivity glass is sometimes misunderstood. One common concern is that it’s too expensive. While the initial cost may be slightly higher, the long-term savings on energy bills and the increased comfort make it a cost-effective investment for both homeowners and designers.

Another misconception is that it makes rooms too dark. This isn’t the case with modern low-E coatings, which allow high levels of visible light transmission, ensuring bright, well-lit open spaces.

Using an experienced manufacturer like Thermotek means that low-E glass will always be installed correctly for optimal performance. We provide expert guidance to ensure seamless integration into your project.

Start Your Journey to Sustainability With Thermotek

Thermotek is proud to be at the forefront of sustainable design, offering a range of window solutions that utilise low-E glass technology. Our products are designed to maximise energy efficiency without sacrificing style.

The Thermotek Boutique Series exemplifies the perfect balance of style and sustainability, offering premium window and door solutions tailored for modern living. Designed with aesthetics in mind, the Boutique Series features sleek profiles and customisable options to suit any architectural style.

It also incorporates low-emissivity glass and energy-efficient uPVC frames, ensuring superior thermal insulation and reduced energy consumption.

The Boutique Series allows designers to create light-filled, comfortable spaces without compromising on environmental responsibility. 

By choosing Thermotek’s sustainable window and door systems, designers and homeowners alike can achieve their vision for eco-friendly, comfortable, and energy-efficient spaces. Additionally, our uPVC frames work in tandem with low-E glass to enhance thermal performance and durability, further reducing environmental impact.Get in touch with us to discover how our products can bring your design vision to life.