If you've shopped for replacement windows before, you've probably noticed the National Fenestration Rating Council's NFRC label, which explains each window’s performance ratings. This label has 6 different energy saving ratings, and each of them will give you specific information on a different aspect of the window’s performance.
The U-Factor represents the amount of heat which can escape through your window. You'll usually see a number between .20 and 1.20. The lower the number, the better insulation your window provides.
Solar Heat Gain Coefficient (SHGC)
This is a number between 0 and 1 which indicates how much solar radiation and heat can enter through the window. The lower the number, the less heat is let into your home.
Visible Transmittance (VT)
This is a number between 0 and 1 and indicates how much light is allowed through your replacement window. The higher the number, the more light is let in.
Air Leakage (AL)
This is the measure of how much air leaks through the window frame, expressed as cubic feet per minute per square foot of frame area (cfm/ft²). The lower the number, the better the seal on your window.
Condensation Resistance (CR)
This number, between 1 and 100, will tell you the relative ability of the glass to prevent condensation from building up on the windows interior. Windows with higher numbers have more resistance to condensation formation.
Light-to-Solar Gain (LSG)
The Light-to-Solar Gain rating is the ratio between SHGC and VT. Use this rating to find windows which permit very bright light to enter your home while blocking heat.
Understanding the NFRC label will allow you to better understand your replacement windows and make the right choice for your home. If you need replacement windows, check out Window World Orlando. Our professional window installers will make sure the job gets done right and at the best price you'll find anywhere.