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Best Practice Guide |
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Glossary |
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Best Practice Guide GlossaryBrowse the glossary alphabetically: U-value or U-factor Return to list of termsA measure of how well heat is transferred by the entire window - the frame, sash and glass - either into or out of the building. U-value is the opposite of R-value. The lower the U-factor number, the better the window will keep heat inside a home on a cold day. Source: California Energy Commission |