Eurolite products are certified by the National Fenestration Rating Council (NFRC), which is the recognized authority in the USA for energy certification of windows and doors. NFRC certification is accepted by state and local building departments throughout the USA and Canada.

NFRC certifies the U-Factor, Solar Heat Gain Coefficient (SHGC), Visible Light Transmittance (VT) and Condensation Resistance (CR). Every certified product carries an official NFRC label showing the energy values for that unit – see the example below.