OKNA Double Hung 300 Series
Thermal Performance Comparison
Double Pane Windows - national and regional window manufacturers
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U-Factor is also known as thermal transmission. It is a measure of rate of heat loss through a product. Therefore, the lower the U-factor, the lower the amount of heat loss.
In cold climates, where heating bills are a major concern, choosing windows with lower u-factors will reduce the amount of heat that escapes through a window from inside your house to the outside.
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Windows should do more than let in the light. They should help cool your home in the summer and warm it in the winter. And they should keep out the wind and resist condensation. Checking the National Fenestration Rating Council (NFRC) energy performance values can help you determine how well a product will perform these functions. By using this information, builders and homeowners can reliably compare one product with another and make more informed decisions about the windows they buy. |
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