VT measures the amount of light let through a window. VT is measured on a scale of 0 to 1; values commonly vary from 0.20 to 0.80. The higher the VT number, the more light you see. HIGHER IS BETTER
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Double Hung
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Casement Windows
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3 Light Sliders
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2 Light Sliders
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Picture Windows
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Awning Windows
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