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Windows | Doors | ||||||
| Climate Zone | U-factor1 | SHGC2 | Glazing Level | U-factor1 | SHGC2 | |||
| Northern | ≤ 0.30 | Any | Opaque | ≤ 0.21 | Any | |||
| North/Central | ≤ 0.32 | ≤ 0.40 | ≤ 1/2-Lite | ≤ 0.27 | ≤ 0.30 | |||
| South/Central | ≤ 0.35 | ≤ 0.30 | ≤ 1/2-Lite | ≤ 0.32 | ≤ 0.30 | |||
| Southern | ≤ 0.60 | ≤ 0.27 | 1 Btu/h×ft2×°F 2 Fraction of incident solar radiation |
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*U-Factor measures the rate of heat transfer. The lower the U-Factor, the better the product insulates. U-Factor ratings for windows generally fall between 0.20 and 0.50. |
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**Solar Heat Gain Coefficient (SHGC) measures the proportion of solar energy penetration. A low SHGC means better shielding from the sun, usually beneficial since it helps keep a home or building cooler in the summer. (NOTE: Homes designed by the architect for passive solar heating will want high SHGC glass on the southern windows.) SHGC ratings for windows generally fall between 0.18 and 0.61. |
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