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U-factor measures how well a product prevents heat from escaping.
Windows typically have a higher U-factor than the rest of the building envelope so structures with high glazing areas are less likely to comply with the energy code.
Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight.
The solar heat gain coefficient (SHGC) for your window may be found on the National Fenestration Rating Council (NFRC) label affixed by the window manufacturer prior to sale.
This article is based on questions regarding Windows asked during the May REScheck Webcast as well as questions received through email.
The IECC has two compliance paths for residential buildings: A Simplified Prescriptive path and a Component Approach.
Energy efficient windows (84 KB)When purchasing a new home, homeowners want their home to be correct in every detail while costing as little as possible.
Selecting Windows for Energy EfficiencyNew window technologies have increased energy benefits and comfort, and have provided more practical options for consumers.
Benefits: Energy and cost savings, improved comfort, less condensation, increased light and veiw, reduced fading, lower HVAC cost.
Fact sheets provide a step-by-step guide to selecting energy efficient windows.