· Check the window’s NFRC rating label. Quality replacement windows will have an NFRC label adhered to each new window.
· The NFRC (National Fenestration Rating Council) is an independent testing organization that rates the “U-Factor” for replacement windows.
· U-Factor is the amount of heat transferred through a material.
· The Federal guideline recommendation is .30 or less
· Lower U-Factor numbers can be achieved. The lower the U-Factor, the slower the heat flow, the better the insulating quality.
· A newer measurement mandated to measure window efficiency is SHGC (Solar Heat Gain Coefficient)
· SHGC measures how much heat is allowed to transfer through the glass by the sun’s rays.
· The lower the number the better. Typically .30 or less.
https://66e9cb.p3cdn1.secureserver.net/wp-content/uploads/2016/04/Schmidt_logo-2016_300.png00schmidthttps://66e9cb.p3cdn1.secureserver.net/wp-content/uploads/2016/04/Schmidt_logo-2016_300.pngschmidt2012-03-05 21:00:512014-02-14 02:52:30How can I tell if a window is energy efficient?
