Fenestration (Window & Door) Replacement
Types of Window Glazing or Glass
In addition to choosing a frame type, you will need to consider what type of glazing or glass you should use to improve your home’s energy efficiency. Based on various window design factors such as window orientation, climate, building design, etc., you may even want to choose different types of glazing for different windows throughout your home.
- Heat-Absorbing Tints – Heat-absorbing window glazing contains special tints that change the color of the glass. Tinted glass absorbs a large fraction of the incoming solar radiation through a window, reducing the solar heat gain coefficient (SHGC), visible transmittance (VT), and glare.
- Insulated – Insulated window glazing refers to windows with two or more panes of glass. To insulate the window, the glass panes are spaced apart and hermetically sealed, leaving an insulating airspace. Insulated window glazing primarily lowers the U-factor, but it also lowers the SHGC.
- Low-Emissivity Coatings – Low-emissivity (low-e) coatings on glazing or glass control heat transfer through windows with insulated glazing. Windows manufactured with low-e coatings typically cost about 10 to 15 percent more than regular windows, but they reduce energy loss by as much as 30 to 50 percent.
- Reflective Coatings – A special type of low-e coating is especially selective, filtering out 40 to 70 percent of the heat normally transmitted through insulated window glass or glazing while allowing the full amount of light transmission. Spectral selective coatings are optically designed to reflect particular wavelengths but remain transparent to others. Such coatings are commonly used to reflect the infrared heat while admitting more visible light.