Window U Factor
From Zissil
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|data8 = A window rating that indicates it's level of thermal insulation.}} | |data8 = A window rating that indicates it's level of thermal insulation.}} | ||
− | A | + | A '''window's U-Factor''' indicates the rate of heat loss of a window unit. Window manufacturers measure a window's resistance by its insulating properties. This measurement is indicated as a U-Factor. The lower a U-Factor, the higher the level of a window's [[Thermal Windows|thermal insulation]]. |
== Measuring the U-Factor == | == Measuring the U-Factor == | ||
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The U-Factor is just one of the components that measures the rate at which a window loses and gains heat. A window's total thermal insulation is measured by the U-Factor along with Air Leakage (AL) and the Solar Heat Gain Coefficient (SHGC). | The U-Factor is just one of the components that measures the rate at which a window loses and gains heat. A window's total thermal insulation is measured by the U-Factor along with Air Leakage (AL) and the Solar Heat Gain Coefficient (SHGC). | ||
− | === | + | === National Fenestration Ratings Council Ratings === |
The U-Factor sometimes refers to just the glass or glazing alone but the [[National Fenestration Ratings Council|National Fenestration Ratings Council]], whose ratings are accepted as industry standards, assesses the entire window performance, including frame and spacer material. These ratings include the U-Factor, the Solar Heat Gain Coefficient and Air Leakage. | The U-Factor sometimes refers to just the glass or glazing alone but the [[National Fenestration Ratings Council|National Fenestration Ratings Council]], whose ratings are accepted as industry standards, assesses the entire window performance, including frame and spacer material. These ratings include the U-Factor, the Solar Heat Gain Coefficient and Air Leakage. | ||
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== U-Factors in Varying Climates == | == U-Factors in Varying Climates == | ||
Homes located in colder climates should include windows with low U-factors. | Homes located in colder climates should include windows with low U-factors. | ||
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[[Category:Replacement Windows]] | [[Category:Replacement Windows]] |