Maximizing Efficiency with Low-E Glass in Double Glazed Windows and Doors

A cool, metal oxide coating applied to clear or tinted glass ensures consistent appearance and performance, regardless of glass thickness. Low-E glass, used in double glazed windows and double glazed doors, leverages technology to improve your views and comfort. Although Low-E glass costs about 15% more than ordinary glass, it reduces energy use by 30-50%, optimizing heat gain in winter and blocking harmful UV rays in summer. When incorporated into upvc double glazed windows, the benefits are amplified. For hot climates, apply the low-E coating to the outside pane of glass. In cold climates, the coating should be on the inside pane to retain heat. Low-E glass is recommended by energy efficiency experts for its high performance and aesthetic appeal.

In the 1970s, the introduction of insulated glass and Low-E glass revolutionized window technology. "E" stands for Emissivity, reflecting heat back to its source using an ultra-thin metallic coating. This coating allows visible light while blocking UV and infrared (IR) light, which can damage materials and generate heat.

Low-E glass reflects IR light, keeping homes cooler in summer by preventing external heat from entering. In winter, it reflects indoor heat back inside, enhancing comfort and efficiency. There are two types of Low-E glass: hard coat and soft coat. Hard coat Low-E glass, with tin applied to molten glass, is durable and scratch-resistant. Soft coat Low-E glass, with a silver layer applied in a vacuum, is protected between glass panes to prevent oxidation and enhance insulation, often with argon gas.

Low-E glass reduces condensation by keeping the interior surface warmer. For instance, on a cold night with 0-degree temperatures and a 15 mph wind, a single pane window might have an inside temperature of 26 degrees, while double pane glass could be 35 degrees. Hard coat Low-E glass would be near 49 degrees, and soft coat Low-E glass at 62 degrees.

Some manufacturers have advanced Low-E technology by suspending low-E films between glass panes, achieving superior performance and blocking up to 99.5% of UV light. These films provide twice the insulation of soft coat Low-E glass. With homes losing up to 40% of heating or cooling through windows, investing in quality Low-E glass is wise.

Summer: Low-E glass in energy efficient windows filters long-wave solar radiation, reducing heat gain and keeping your home cooler. It blocks UV and reflects infrared radiation, minimizing indoor heat.

Winter: In winter, Low-E glass allows warm solar rays in while reflecting indoor heat, conserving energy and reducing heating costs.

Incorporating Low-E glass in double glazed windows and doors, especially those manufactured in Sydney, enhances energy efficiency and comfort, making it a valuable addition to your home.