Fortunately, in recent years, double-paned windows, along with other energy-efficient features, have become more standard.

The building itself has several energy-efficient features.

Rose's designs incorporate energy-efficient features, such as geothermal, planted roofs, and louver systems that increase natural lighting.

Working with an architect they built their dream house, ahead of its time with its energy-efficient features.

Many have unusual designs and are packed with energy-efficient features.

Griffith said capital improvements would be directed toward projects such as retrofitting existing housing with more energy-efficient features.

Energy minister Malcolm Wicks has praised the new development in Croydon, for its innovative design and energy-efficient features.

The building's energy-efficient features include use of structural insulated panels (SIPs) for the building's exterior walls and roof.

A key reason, industry professionals say, is the cost to incorporate energy-efficient and environmentally sensitive features into housing that relies heavily on public financing.

They featured energy-efficient features, such as their roof overhangs and double glazed windows.