Double Glazed Windows

Double Glazed Windows & Doors supplier in Sydney

What is a Double Glazed Window?

A double glazed window is created by using two panes of glass that are sandwiched together with a spacer in between, this spacer could be ).5mm, 6mm, 9mm, 12mm or 20mm and  is called A Double Glazed Unit.The air between the two window panes in the window frame space is known as a cavity where generally the air is vacuumed sealed. Nowadays, double glazed windows are made up with many different gases as a substitute for air within the cavity, Argon being the most popular and commonly used gas. The Double glazed windows are filled with argon will not require any refilling throughout the life of the window. Low maintenance is always a bonus while choosing products for a home.

We can offer windows with Aluminium frames, Thermally broken Aluminium or PVC Vinyl to suit your needs.

Benefits of Double Glazed Windows

That feeling of at home comes with utter comfort 

Modern and high-tech buildings are constructed in such a way that you can experience all the luxuries and comfort right in your home. There are several benefits to consider double glazed windows: 

Makes your space more comfortable

Your interior space needs air conditioning or air circulation to keep your home’s temperature maintained. Having double glazed windows reduces the need for an external air conditioner. This makes you feel comfortable throughout the day and year. The comfortable environment in the house is what turns it into your home. The place where every bit of floor, corner and even air is yours. These double glazed windows actually make you feel the same. The outside environment becomes part of your home and you realize being part of nature. 

Restores peace and calm in your home

The atmosphere in your home makes and breaks your mood. The place where you choose to dwell forever, why not make it the heavenly place. With double glazed windows, you literally get that heavenly feel right where you live. The harmony and calmness gives an invitation to the environment that space has. This exact atmosphere is brought home with the air space that the double glazes carry in between them. The kind of temperature that IoT enabled homes and offices have, is achieved with double glazed windows. 


Lower Energy Bills and higher home security

The comfortable and just right environment in the room makes you use Air conditioners and heaters a bit lesser. This ultimately saves you energy bills. Moreover, with double glazed windows, your home is more secure. The double glazes have two glasses, which ultimately increases the security level by one layer. With double glazes, you are overprotected and comfortable. 

Double glazed windows are an ideal energy efficient choice with the added benefit of minimising noise. The sealed air gap between the two panes acts as an added layer of insulation. This added thermal resistance reduces the amount of heat escaping in winter and keeps your home at a more comfortable temperature. Double glazing has the reverse effect in summer, preventing unwanted heat from coming into the home. This extra insulation lessens your reliance on artificial heaters and air conditioners and can ultimately reduce your energy costs.

When you are close to a window, your comfort is also affected by the temperature of the glass. With double glazing it’s harder for the unwanted outside temperature to transfer through, leaving the inside pane close to room temperature. Double glazing also reduces condensation which can result in the unhealthy formation of mould.

Sealed double glazing is effective at reducing medium to high frequency noise such as the human voice. A difference in glass thickness between the inner and outer panes will improve sound reduction even further.

Double glazed windows are considered a safer option when compared to standard single pane windows. Two sheets of glass are a lot harder to break than one and for even greater security you can specify toughened or laminated glass.

What to look for
Amount of space between panes

The typical space between panes ranges from 6mm to 20mm. A minimum space of 12mm is recommended for optimum thermal performance. Alternatively, for good acoustic control and to reduce low frequency noise such as traffic and aircraft, the optimum air gap recommended is 150mm or over. Note that such large gaps allow convection to occur between the panes and reduce insulating performance.

For better energy efficient performance choose double glazing with a space of 10 to 20mm between the panes.

What’s in between
Amount of space between panes

Because the space between the panes in double glazed windows is fully sealed, it acts as an insulator, limiting the transfer of cold air coming into your home. Thermal and acoustic performance can also be increased when gas fills this space. The most popular gas used is argon which has low conductivity properties to improve insulation.

Inert, low conductivity gas inserted between panes will increase performance.

Double glazed units include a spacer which is a metal or polymer strip that separates the two panes of glass. Typically, spacers contain a desiccant (drying agent) to remove moisture trapped in the air space.

Type of glass used

A wide range of different glass types, such as low-e and laminated, can be used in double glazing units to further increase energy efficiency and noise control. Low-e glass will further reduce the amount of heat escaping while thicker laminated panes disrupt sounds waves to improve acoustic performance.

Common problems

Windows need to be considered as a whole unit. The framing material you choose to complement your glass may enhance its performance or in some cases reduce its energy efficient properties. Standard aluminium window frames readily conduct heat and cold and if not thermally enhanced, may eliminate any benefit from installing expensive double glazing.
How well the cavity is sealed and the type of spacer used is also an important factor to consider. If the double glazed unit is not sealed properly or if the spacer does not contain adequate desiccant, it can reduce performance and condensation will appear on cold surfaces.

Low-e glass

WindowsEnergy efficiencyInsulationClimate control
Low-e is standard clear glass which has a special coating on one surface of the glass. Low-e refers to low emissivity and this describes the capacity of a surface to radiate heat. Emissivity is measured across a scale from 0 to 1 with 1 representing the highest emissivity.

Low-e glass

The low-e coating is spectrally selective, which means it affects some wave lengths of light but not others. Long wave infrared is the heat produced by our bodies, heaters and the furnishings in a warm room. The transmission of long wave infrared is significantly reduced by the low-e coating. It reflects the amount of energy escaping through the glass keeping the room warmer and reducing the amount of heat required to be generated by the artificial heaters. The energy from the sun is called short wave infrared; a high proportion of energy from the sun will be transmitted straight through the glass.
Low-e coatings provide various performance levels and the glass can be used in a variety of ways including single glazing, laminated glass or double glazed windows.

The benefits of low-e glass

Low-e glass can reduce the amount of heat that is conducted through the glass by around 30% compared to ordinary glass. Low-e glass further improves thermal efficiency by cutting glare and preventing damage interior furnishing caused by ultra-violet rays.
Newer generation low-e often uses laminated and toned glass combinations to provide superior performance over non coated glass. The most comprehensive solution is found by combining a low-e coating with double glazing. Using low-e coating and a suitable frame can stop up to 70% of heat loss and 77% of heat gain when compared to standard 3mm glass.
The lower the emissivity value of the glass, the less heat absorbed and re-radiated through to the colder side.
The emissivity of the surface of a material is its effectiveness in emitting energy as thermal radiation. heat shielding

Hard or soft coat low-e glass

There are two types of low-e glass: hard coat (online) or soft coat (offline). Hard coat low-e glass is made by coating the glass during production with a thin metallic oxide layer, effectively welding it to the glass surface. Soft coat low-e glass, or sputter coating, is applied to glass that has already been formed. The glass enters a vacuum chamber filled with an inert gas which is electrically charged. The electricity combined with the vacuum allows molecules of metal to sputter onto the glass. This process provides the highest level of performance and a nearly invisible coating.
Hard coat low-e glass is the more common variety. It is durable and difficult to scratch, and can be used for single-glazed applications. On the down side, it has higher U-values compared to soft coat low-e glass, and slightly higher haze levels.
Soft coat low-e glass, on the other hand, is less common, and allows more visible light in with less visible haze. Its ultra-low emissivity also gives excellent U-values. The down side of soft coat low-e glass is that it must be used in double glazed windows, and that there can be slight colour variations. Soft coat is less durable than hard coat.

Glass surfaces are conventionally numbered, starting at the outside, with surface #1.

Which side of the glass to coat

The effectiveness of low-e glass is dependent on the direction the coating is facing. For single pane windows it is recommended the low-e coating is always placed on the inside facing surface. Low-e coatings are sensitive to weather and pollutants making it difficult to clean without damaging the surface.
In double glazed windows low-e glass can be specified on a particular side of the glass depending on what you want to achieve. For warm climates where summer heat reduction is a priority, the coating should be on the inside facing surface of the outside pane (surface #2). This will minimise heat coming into the home by absorbing solar radiation and reflecting it back outside.
In cold climates where retention of heat is a priority, the coating works best by facing outwards on the inside pane (surface #3). The coating will work by absorbing inside heat and reradiating it back into the room.

Common problems

Low-e glass reduces solar gain in winter as well as summer. For this reason it is not recommended for solar control in colder climates when the winter sun provides valuable natural heating. It is more beneficial to use low-e glass with double glazing to only reduce winter heat loss.


Energy Efficient Double Glazed Windows

Make your home Warmer in Winter and Cooler in Summer 


Everyone loves to spend time in nature and be in the comfort zone, all at the same time. Energy-efficient double glazed windows allow you to do exactly this. Our custom designed Double Glazed Windows not only look amazing, but they contribute to a comfortable as well as cosy atmosphere inside your home or office irrespective of the weather outside. Double Glazed Windows are engineered and designed for making the concept of ventilation smart. Double glazed windows will make the ventilation better by keeping the room temperature comfortable throughout the year. Hence, they are referred to as energy efficient. The right temperature for your home will save you energy and money by reducing energy bills. The double glazed windows are stronger and thicker than the simple single glazed ones. They have two glasses with an air gap in between. This air in between acts as thermal resistance. Maintaining just adequate temperature inside the room. These windows are meant for maintaining your room temperature without actually exchanging the winds. The light penetration through this window becomes so convenient that the usage of electricity is naturally reduced. Natural lights are utilized at its maximum. You need not turn on your lights until the sun is fully set. Hence the windows are called energy efficient. And this is the most useful feature of such windows.

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