All Ener-Save windows meet or exceed North American standard requirements for air tightness, wind-load resistance, water penetration and forced-entry prevention.
The International Energy Star symbol is a simple way for consumers to identify products that are among the most energy-efficient on the market. Only manufacturers and retailers whose products meet the Energy Star criteria can call their product Energy Star.
Understanding what the numbers mean
Energy Star Zone: The Area within North America that the window has been rated for testing.
U Factor: Measures how well a product prevents heat from escaping. The rate of heat loss is indicated in terms of the U factor (U Value) of a window assembly. U factor ratings generally fall between 0.20 and 1.20. The insulating value is indicated by The R – Value which is the inverse of the U – Value.
Solar Heat Gain Coefficient – (SHGC): Measures how well a product blocks heat caused by sunlight. The SHGC is the fraction of incident solar radiation admitted through a window, both directly transmitted and absorbed and subsequently released inward. SHGC is expressed as a number between 0 and 1. The lower a windows SHGC, the less solar heat is transmitted.
Energy Rating – (ER): An overall measure of the window’s energy performance, the higher the number the better the performance.
National Fenestration Rating Council
To address concerns about energy consumption, the fenestration industry developed a host of new energy efficient technologies: low-e coatings, low-conductance spacers, gas fills, etc. NFRC’s sole mission is to establish a fair, accurate, and credible rating system for fenestration products and to coordinate certification and labeling activities to ensure their uniform application. NFRC’s rating procedure is designed to meet the requirement of the Energy Policy Act of 1992 and certain federal government program requirements (DOE, FTC).
American Architectural Manufacturers Association
(AAMA) Since 1962 AAMA’s ANSI has been the only accredited third-party window performance verification program that has provided manufacturers with the means to independently demonstrate product performance. The AAMA Certification Label on a product tells customers that a product sample has been verified as conforming to the requirements of AAMA’s standards through independent laboratory testing and follow-up on-site inspection of the manufacturer’s production line.
Window Wise™ is an independent company that audits and certifies window contractors and manufacturers to ensure that homeowners are getting quality products and that their windows are being installed correctly by conducting training seminars. Window Wise™ audits companies based on energy-efficient windows, dealers certification, installer certification, product and installation criteria, and warranty information.