• Strategic Approach
• Recommendations
• Options
• Building Examples
• Library

Building Envelope  »  Fenestration

• Overview
• Description
• Impacts
• Examples
• References

Savings

It has been studies that replacement of standard, single-glazed windows with moderately advanced windows (double glazing, low-e, SHGC of 0.39 instead of 0.85) alone saves 17% of cooling energy use in standard houses in Florida and permits a 25% downsizing of the cooling equipment (Anello et al, 2000).

The total energy consumption can be reduced by about half through high-performance windows in cold climates. A comparison between a double glazed window with a U-value of 3.41 W/m²K and an advanced triple glazed window with a U-value of 1.14 W/m²K shows that the total energy consumption in a 5m zone behind the window is reduced by about half in the case of a triple glazed advanced window*.

*_{total energy consumption incl. cooling, heating, ventilation and lighting energy needs. In the case of an advanced window, the lighting was also controlled with a daylight sensor. The wall to window ratio was 0.6.}