Reducing your energy bills is easier than you think—and your windows & doors play a major role in achieving this.
One of the most effective solutions is double glazed windows and doors. But just how much money can you save on energy bills with double glazing? Windows Tech is here to help yo discover the benefits and savings associated with this energy-efficient home improvement.
How Double Glazing Saves Energy
Double glazing involves the use of two panes of glass separated by a layer of air or gas, typically argon, which acts as an insulator. The result is a more consistent indoor temperature, reducing the need for excessive heating and cooling.
Here’s how it contributes to energy savings:
Thermal Insulation: The gap between the two panes of glass acts as a barrier to heat transfer. In winter, this means less heat escapes from your home, reducing the need for heating. In summer, it helps keep the heat out, reducing the need for air conditioning.
Reduced Draughts: Double-glazed windows are typically better sealed than single-glazed windows, reducing draughts and cold spots in your home.
Lower Energy Consumption: By maintaining a more consistent indoor temperature, your heating and cooling systems don’t have to work as hard, leading to lower energy consumption and, consequently, lower energy bills.
Read our blog: How Do Double Glazed Windows Work?

Australian Climate and Energy Consumption
Australia’s climate varies widely, from the tropical north to the temperate south. Regardless of where you live, maintaining a comfortable indoor temperature can be a significant energy expense. In colder regions, heating can account for up to 40% of a household’s energy use, while in warmer areas, cooling can represent a substantial portion of the energy bill.
Average Costs of Energy Bills in Melbourne
Understanding the average costs of energy bills in Melbourne is essential for homeowners considering energy-saving improvements like double glazing. Discover the latest census data and electricity usage benchmark data collated by the Australian Energy Regulator (AER).
| Household Size | Daily Electricity Use | Monthly Bill | Quarterly Bill |
|---|---|---|---|
| 1 Person | 8.09 kWh | $103.79 | $311.37 |
| 2 Person | 13.26 kWh | $148.33 | $444.99 |
| 3 Person | 13.91 kWh | $153.94 | $461.81 |
| 4 Person | 15.90 kWh | $171.11 | $513.34 |
| 5+ Person | 20.14 kWh | $207.64 | $622.91 |
Calculating the Savings
The actual savings you can achieve with double glazing will depend on several factors, including the size of your home, the type of windows you currently have, and the climate in your area. On average, double glazed windows offer a reduction in heat loss by as much as 64% compared to single glazed windows.
Let’s take a look at some examples:
Example #1: Melbourne
In Melbourne, where winters can be quite chilly, a typical home with single-glazed windows might spend around $2,000 annually on heating. By upgrading to double glazing, you could reduce your heating costs by up to 30%. This translates to a saving of $600 per year.
Example #2: Brisbane
In Brisbane, where the summers are hot and humid, cooling costs can be significant. A household spending $1,500 annually on cooling could see a reduction of up to 20% after installing double-glazed windows. This equates to a saving of $300 per year.

Long-Term Financial Benefits
While the initial cost of installing double glazing can be substantial, the long-term financial benefits make it a worthwhile investment. Here are some points to consider:
Return on Investment: The energy savings you achieve each year will eventually offset the initial installation cost. Depending on the extent of your energy savings, you might recoup your investment in 5 to 10 years.
Increased Property Value: Double glazing is an attractive feature for potential buyers, increasing the resale value of your home. Energy-efficient homes are in high demand, and double glazing can make your property stand out in the market.
Reduced Maintenance Costs: Double-glazed windows are more durable and require less maintenance than single-glazed windows. This can lead to additional savings over the years.
Environmental Impact
Beyond the financial benefits, double glazing also has a positive impact on the environment. By reducing your energy consumption, you’re also reducing your carbon footprint. This contributes to the global effort to combat climate change and promotes a more sustainable future. Ultimately, upgrading your windows could help the planet breathe a little better.
Making the Switch: What to Consider
If you’re considering upgrading to double glazed windows, here are a few factors to keep in mind:
Quality of Installation: To maximise the benefits of double glazing, it’s crucial to have the windows installed by a reputable and experienced professional. Poor installation can negate the energy-saving benefits.
Learn more about our installation services at Windows Tech:
- Sliding door installation in Melbourne
- Entry door installation in Melbourne
- Sliding window installation in Melbourne
- Tilt and turn windows in Melbourne
Window Frames: The type of window frames you choose can also impact energy efficiency. uPVC, timber, and aluminium frames all have different insulation properties. Consult with your installer to determine the best option for your home.
Local Climate: Consider the specific climate in your area. In regions with extreme temperatures, the savings from double glazing will be more significant. You might also want to consider triple glazed windows for even more savings.

Your Window of Opportunity for Big Savings
Whether you’re in the chilly south or the sweltering north, double glazing can help you achieve a more energy-efficient and comfortable home—ultimately putting more money back in your pocket.
Windows Tech, a Melbourne-based manufacturer and installer, is a leading provider of top-quality double glazed uPVC windows and doors. Feature a high-grade German-manufactured profile by Aluplast along with corrosion-proof hardware, our products guarantee smooth operation and a lifetime of unparalleled performance.
Every single component has been tested and exceeds Australian standards, allowing us to supply metropolitan, regional, and coastal areas. We’re setting the bar high for double glazed windows because you deserve nothing less than top-tier quality for your home.
Contact us today—and get a 10% price-beat guarantee.
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