Low-e window film is a low-cost alternative to window replacement to transform existing poorly-insulating windows into energy-efficient windows.

A variable tinting, energy-efficient window can easily be produced by combining and integratng basic photo cells, temperature sensors and microprocessors into its control circuitry.

We would like to install insulated, energy-efficient windows.

Let's say you're trying to sell energy-efficient windows.

The plan includes a new roof, sidewalks, elevator mechanical systems, energy-efficient windows and repairs to the mortarwork.

A $14 million renovation project was substantially completed in 2008, including new energy-efficient windows, ceilings, lighting, remodeled bathrooms, and doors.

When energy-efficient windows were installed in East River Housing several years ago, temperature levels in the apartments shot up.

If you built on a north-facing slope, you'd want to add more energy-efficient, possibly smaller, windows.

The rapporteur proposes more energy-efficient windows.

Its north side is built into a hill, with the south side containing several energy-efficient windows and a large skylight.