All Thermal Industries Window and Patio Door products specified with either our Peak or Super Peak Performance™ Glass Packages are ENERGY STAR® qualified for all 50 states. ENERGY STAR qualified windows keep your home more comfortable year round while helping lower energy bills and save the environment.
Glass Performance Terms & Definitions:
R-Value: Measures the insulating value, or resistance to heat gain or loss. The larger the number, the better the resistance to heat flow. The R-Value is equal to one (1) divided by the U-Factor.
U-Factor: Measures how well a product prevents heat from escaping. The lower the U-value, the greater a window's resistance to heat flow and the better its insulating value, the slower the rate of heat flow. Note the U-Factor is equal to one (1) divided by the R-Value.
Solar Heat Gain Coefficient (SHGC): measures how well a product blocks heat caused by sunlight. The lower a window's SHGC, the less solar heat it transmits.
Ultraviolet Light Transmittance: Portion of the solar spectrum that is both visible and invisible to the human eye. Can cause fabric fading and degrading. Can also cause eye damage from prolonged exposure.
Visible Light Transmittance: Measures how much light comes through a product. The higher the number, the more light is transmitted.
*NOTE: The values listed above are the CENTER OF GLASS performance characteristics. Results are achieved by using Lawrence Berkeley Laboratories Windows 5.2. These values are the highest results achieved by Peak Performance LoE2 Glass using NFRC environmental conditions.
The U-Factor values on The temporary 4" x 6" labels supplied on our window and door products are NFRC results for the ENTIRE WINDOW or DOOR UNIT, both vinyl AND glass components combined. These values are achieved by the certifying agency by analyzing the entire window's thermal performance. Therefore, these numbers relate to the entire window's performance and will generally be lower than the Center of Glass number.
