Unfortunately "energy efficiency" in glass products has traditionally come at the expense of visual transparency. Conventional glass products achieve low energy transmission using either dark tints or visibly reflective coatings, or both, resulting in low light transmission and a mirror-like appearance.

Southwall's XIR® Laminated glass and Heat Mirror® Insulating glass products provide energy efficiency without this compromise. By selectively reflecting invisible heat while transmitting visible light, Southwall's products provide transparency as well as energy efficiency.

In cold winter conditions, Heat Mirror's very high insulation performance reduces the need for perimeter heating systems otherwise needed for comfort in commercial buildings, thus providing further energy savings.