Energy Efficient Windows can create a more comfortable, light filled and secure space, as well as help reduce your heating and cooling costs.
To help reduce greenhouse emissions the Australian Government, through the Buildings Code Board Energy Star Ratings, specifies the minimum performance required of products in the building facade. These include the roof, walls, cladding, windows and doors. The main drivers are:
Energy loss in winter, and
Heat gain in summer.
Reduce Energy Consumption & Improve Comfort
Ordinary glass allows heat to easily enter and leave the building throughout the day. Your window selections should consider heat loss and gain, ventilation and insulation properties together with your location, window orientations and shading.
G.James has a large range of glass types that help insulate your home, to keep a comfortable temperature throughout the day.
Contact your nearest G.James Branch for product information specific to your project.
Energy Efficient Products
There are four main types of glass that serve the purpose of reducing energy loss or gain; the correct selection is greatly influenced by where you live in Australia.
- Toned Glass
Toned glass (also known as "tinted" glass) has metal oxides introduced into the raw glass mix. These intercept energy from the sun, convert this to heat, a portion of which is released to the outside of the building.
This is a glass best suited to warm climates as it improves the Solar Heat Gain 1 value.
- Low "E" Glass
Low “E” glass has a thin, transparent metal coating applied to the glass surface. This is designed to reduce the rate at which heat enters or escapes from your building.
In the correct configuration, Low "E" is suitable for any climate. For example, in cooler climates Low "E" incorporated into an IGU (Insulated Glass Unit), and in warmer climates a G.James Solect® Low "E" laminate may be more suitable.
- Double Glazing
G.James offers Twin-Glazed Insulated Glass (IG) Units / ECOtherm® Units - more commonly known as double glazing. Two (or more) panels of glass are separated by an air space, acting as an insulator against heat loss or heat gain.
Insulated glass units can be a good energy efficient option depending on your location - advice should be sought if you live in a predominantly warm or hot climate.
- Reflective Glass
G.James Solarplus® is a Reflective glass with metals applied to the glass surface that produce a slight mirror effect, reflecting a portion of the sun's energy before it enters the building.
This glass is more suitable for warm or hot climates and is more commonly used in commercial rather than in residential buildings.
For further technical information view the Glass Performance Data for our range of Glass options
- 1Solar Heat Gain Coefficient (SHGC) is the portion of the sun's energy that passes through the window and inside the building. The lower the number the SHGC, the the better the glass is able to exclude solar radiation.
- 2U-Value is the measure of heat transfer through glass or a window. The lower the U value, the lower the rate of heat transfer.