Triple-Pane / Triple-Glazed

Related terms

• Insulation

  Material that resists heat flow, rated by R-value, installed in walls, ceilings, and floors. Opened walls are the opportunity to upgrade…

• U-Factor

  The rate of non-solar heat flow through a window; lower means better insulation. The primary winter-performance metric on the NFRC label.

• Transom

  A window above a door or window, fixed or operable, adding daylight and architectural detail.

• Vinyl Window

  A PVC-framed window — low cost, low maintenance, good insulation. The dominant residential replacement material; quality varies widely by…

• Threshold

  The bottom member of an exterior door opening, often adjustable, that works with the door bottom and sweep to seal out water and air.

• Visible Transmittance (VT)

  The fraction of visible light a window transmits (0–1); higher means a brighter, clearer view.

• Thermal Break

  An insulating barrier within a metal frame that interrupts heat conduction, substantially improving an aluminum window's efficiency.

• Weatherstripping

  Compressible seals around a door or operable window perimeter that block air and water infiltration. A cheap, high-impact efficiency item.