What is an NFCR rating?
The National Fenestration Rating Council (NFCR) is a non-profit collaborative of manufactures, builders, designers, government officials, utilities and consumers which provides unbiased energy performance ratings for window, door, skylight (or fenestration). NFRCs labels provide product-specific performance ratings for technical qualities such as U-factor (the rate of heat loss from your home through the window), and Solar Heat Gain Coefficient (how much heat your house gains from the sun as a result of the windows performance). Look for lower U-factor and appropriate SHGC numbers for highest efficiency performance in your area of the country.
