Energy Efficient Windows and Doors Explained



Whether you’re renovating or about to start construction on a new home, there’s no doubt energy efficiency has been a topic of conversation. As the climate continues to change, investing in energy-efficient windows and doors is key to extending the lifespan and comfort of your home while reducing your environmental impact.


Over the last two decades, the average Australian energy use per household has decreased due to energy efficient, passive design principles.

Choosing energy-efficient windows is a great solution to reduce the energy consumption generated by heating and cooling your home. Instead of relying on air conditioning in summer and heating during winter, they work with the climate to make sure your home is comfortable no matter the season.

Windows are responsible for most unwanted heat loss and heat gain from your home throughout the year. Selecting the appropriate design, seals and glass type for your home and location is essential as a homeowner.


Toned glass is a simple yet compelling way to restrict the entry of heat and glare from the sun from entering your home.

This impactful design uses metal oxides from raw glass to reflect light and minimise glare from the outside entering your home.

Tinted windows cleverly absorb heat that is released back outside, keeping your home cool throughout the day. For warmer climates, toned glass is particularly effective to reduce the need for air conditioning on hot days.

Learn more about our Solar Block™ windows and doors.

energy efficient fixed windows and louvre windows


Low-E glass or low emissivity glass features a thin layer of metal or metal oxide coating on one side to minimise heat transfer.

The addition of this metal or metal oxide works to reduce heat entry and heat loss, keeping your home at the perfect temperature year-round.

Windows with low-E glass act as insulation from the weather outside, keep hot air out during summer and retain warm air inside during winter. Low-E glass is recommended for locations where maintaining a comfortable temperature is crucial year-round.

Learn more about our Solar Comfort™ windows and doors.

energy efficient sliding doors



Double glazed windows feature two or more panes of glass sealed with an air space between each layer (IGU), creating strong insulation from the outside elements.

The better performing double glazed windows feature toned or low-E glass and argon gas to create a more substantial thermal barrier.

Homes with double glazing windows and doors have been proved to decrease power bills by up to 20% compared to those with only single-glazed.

Many people believe double glazing is only beneficial for colder climates. In fact, due to their unique insulation properties, they are suitable for hot, cold and mixed climates.

Learn all the benefits of double glazed windows and doors.

Double Glazed Windows and Doors with Ultra Silver aluminium frames

Double Glazed Windows with Thermal Breaks

By including thermal breaks in double glazed windows, the energy efficiency of your windows and doors dramatically increases.

In addition to the bonded panes of glass that feature in an IGU, the aluminium frame is separated by less conductive materials to reduce heat transfer.

These insulated barriers are often reinforced polyamide, which works with the IGU to retain or reflect heat.

As is with traditional double glazing, thermal break windows and doors are recommended for all-weather climates.

Learn more about our thermal break windows and doors.

Thermal Break Sliding Window and Circle Window for superior energy efficiency

Window and Door Seals

The quality of your window and door seals can make or break the level of energy efficiency.

Without high quality, weatherproof seals, even the most energy-efficient windows cannot maintain the ideal controlled indoor climate due to air leaking in and out.

Choosing the right material for your window sealing is essential to receive all the benefits of energy-efficient windows. Using more durable seals made out of materials such as Santoprene is recommended over those like vinyl, which run the risk of cracking, shrinking and losing their shape over time.


When selecting your energy-efficient windows, using the Window Energy Rating Scheme (WERS) can be highly beneficial in making your decision.

The two key measures are U value and SHGC, which apply to the entire product and not individual components of the window (i.e. glass, seals or frame). The U-value measures the rate of heat transfer and loss. A lower U-value indicates that the window is more resistant to heat flow and has greater insulation.

Solar Heat Gain Coefficient (SHGC) measures how successful a window is in blocking heat caused by sunlight. If a window has a lower SHGC rating, less solar radiation will pass through the window.


Investing in energy-efficient windows and doors doesn’t just ensure comfort and liveability for you.

It is an investment in creating a healthier and cleaner environment. Integrating the clever design of these types of windows and glass in all climates helps reduce power consumption and emissions.

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energy efficient sliding doors

Selecting Windows & Doors

Product Selection Guideline

The perfect windows and doors can lift a space from ordinary, to extraordinary. But choosing the right ones for your home or project can be a challenge – especially if you’re new to the process. That’s why we’ve put together this selection guideline.

Written as a simple, easy-to-understand reference, this guide will help you better understand your requirements, ask the right questions, and find the best windows and doors for your project.

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Product availability, features, options, sizes, configurations and performance are subject to regional variations, design requirements, and building codes. Images are for illustration purposes only and may not accurately represent the product. Bradnam’s Windows & Doors reserves the right to change, alter or delete any aspect of this product without notice. We recommend visiting a Bradnam’s showroom before ordering to view colour swatches, glass samples and actual products.