Frequently Asked Questions

The U-Value measures how much heat passes through a window or door.

Simply put:

The lower the U-Value, the better the insulation.

Lower U-Values help:

• Keep homes warmer during winter
• Keep heat outside during summer
• Reduce heating and cooling costs
• Improve year-round comfort

Our thermally broken double-glazed systems achieve significantly lower U-Values than conventional aluminium single-glazed windows.

Traditional aluminium frames conduct heat quickly because aluminium is an excellent conductor.

Our Thermal-Link Technology incorporates a high-performance thermal barrier between the interior and exterior aluminium sections.

This dramatically reduces heat transfer through the frame, meaning:

• Warmer interiors during winter
• Cooler interiors during summer
• Improved energy efficiency
• Reduced condensation
• Greater occupant comfort

Combined with double glazing and argon gas insulation, our systems deliver exceptional thermal performance.

SHGC (Solar Heat Gain Coefficient) measures how much solar heat passes through the glass.

The value ranges from 0 to 1.

• Lower SHGC = Less solar heat enters the building
• Higher SHGC = More solar heat enters the building

Selecting the correct SHGC depends on the orientation of your home and local climate.

For Australia’s East Coast, selecting the right SHGC can:

• Reduce overheating in summer
• Lower air-conditioning costs
• Improve indoor comfort
• Maximise natural daylight

Both ratings are equally important.

Winter

A low U-Value keeps valuable warmth inside your home, reducing heating costs.

Summer

A low SHGC limits unwanted solar heat entering the building, reducing cooling costs.

Choosing the right combination creates a comfortable home all year while significantly reducing energy consumption.

Every home is different.

Window orientation, shading, climate and building design all influence which glazing system performs best.

For example:

North-facing windows

• Benefit from carefully selected SHGC values to manage summer heat while allowing natural light.

South-facing windows

• May benefit from higher SHGC values to maximise passive solar warmth during winter.

Wind-exposed areas

• Benefit from lower U-Values to minimise winter heat loss.

Our experienced team works closely with builders, architects and homeowners to specify the ideal glazing solution for every project.

Low-E (Low Emissivity) glass features a microscopically thin coating that reflects heat while still allowing natural light to pass through.

Standard glass has a high emissivity, meaning it readily absorbs and transfers heat.

Low-E coatings dramatically reduce this heat transfer, improving energy efficiency and comfort.

The ACG Advantage

Because our Thermally Broken Thermal-Link framing system already provides outstanding insulation, many projects can achieve their required energy ratings without needing the additional cost of Low-E glass.

Where project requirements call for even higher thermal performance, Low-E glass can also be incorporated into our systems.

This provides builders and homeowners with greater flexibility while helping manage project costs.

Yes. All ACG window and door systems are designed and tested to comply with AS2047 – Windows and External Glazed Doors, ensuring they meet Australia’s stringent requirements for structural performance, weather resistance, water penetration and operational performance. We can also provide compliance documentation for residential and commercial projects.

Yes. Our systems are available for bushfire-prone areas and can be manufactured to meet BAL40 compliance when specified. We work closely with builders, architects and certifiers to ensure the correct glazing and framing systems are selected for each project’s Bushfire Attack Level requirements.

Our thermally broken aluminium systems combined with high-performance double glazing significantly reduce external noise, creating quieter, more comfortable living and working environments. We can customise glass configurations to achieve specific acoustic ratings for homes near roads, rail corridors, airports and busy urban environments.

Every ACG window and door is custom manufactured to suit your project. Lead times vary depending on project size, system selection and glazing requirements, however our team provides accurate production schedules and regular progress updates throughout the manufacturing process to keep your project on track.

We offer flexible solutions to suit every project, including supply only, supply and delivery, or complete supply and installation by our experienced installation teams. Our services are available across residential, commercial and large-scale architectural developments.

Yes. As part of our complete service, we can safely remove your existing windows and doors prior to installing your new ACG systems. We are happy to include the removal and disposal of your existing windows and doors as a separate item within your quotation, giving you a complete and transparent cost for the entire project.

ACG products are backed by a comprehensive 10-year product warranty, providing confidence in the quality, durability and long-term performance of our windows and doors. Our Sydney-based support team is available to assist with after-sales service and technical advice whenever required.

Our systems are designed for low maintenance. We recommend periodically cleaning the frames, glass and tracks with mild detergent and water, lubricating moving hardware where required and removing any debris from drainage channels. Regular maintenance helps maximise performance and longevity, particularly in coastal environments.

We offer an extensive range of premium powder coat and anodised finishes, including the most popular Australian architectural colours, along with custom colour matching where required. A wide selection of premium hardware, handles, locking systems, hinges and accessories is available to complement every architectural style.

Yes. Our window and door systems are specifically engineered to withstand Australia’s harsh coastal conditions and are available with marine-grade powder coating, premium stainless steel hardware and corrosion-resistant components, making them ideal for beachfront and waterfront properties. For added peace of mind, our coastal systems are backed by a 20-year powder coating warranty, ensuring long-lasting durability, superior corrosion resistance and exceptional performance in demanding marine environments. We can also recommend the most suitable glazing and hardware specifications based on your project’s location.

Absolutely. We partner with architects, builders, developers and homeowners from concept through to completion. Our team provides design assistance, shop drawings, engineering support and customised glazing solutions to ensure every project achieves outstanding architectural results while meeting performance, compliance and budget requirements.

Yes. ACG Windows & Doors is 100% Australian owned with a dedicated Sydney-based design office, showroom, project management team and experienced installation crews supporting projects across New South Wales. Our local team works closely with homeowners, architects and builders from the initial design consultation through to installation and completion, while our responsive after-sales support ensures ongoing service and peace of mind long after your project has been delivered.