Thermal Windows Thermal Windows Windows serve many purposes in commercial buildings, merchandise displays, aesthetics, natural daylighting, ventilation, etc. Unfortunately, windows are poor insulators and heat can easily escape through them, wasting your energy dollars. Your energy cost can be reduced and comfort improved by installing thermally improved windows.
Many older buildings have single-pane or single glazed glass windows.
Currently the new construction standard is double-pane glass. Triple-pane glass is even more energy efficient. A window's insulating level is referred to as its R-value. Additional panes of glass seal in air, which is a better insulator than glass. The R-values for different types of windows are listed below.