| Table 1: Version 7.0 Efficiency Requirements | |||||||||||
| Prescriptive Requirements for Windows | |||||||||||
| Climate Zone | U-Factor1 | SHGC2 | |||||||||
| Northern | ≤ 0.22 | ≥ 0.17 | |||||||||
| North-Central | ≤ 0.25 | ≤ 0.40 | |||||||||
| South-Central | ≤ 0.28 | ≤ 0.23 | |||||||||
| Southern | ≤ 0.32 | ≤ 0.23 | |||||||||
| Equivalent Energy Performance Requirements for Windows | |||||||||||
| Climate Zone | U-Factor1 | SHGC2 | |||||||||
| Northern | = 0.23 | ≥ 0.35 | |||||||||
| = 0.24 | |||||||||||
| = 0.25 | ≥ 0.40 | ||||||||||
| = 0.26 | |||||||||||
| Requirements for Skylights | |||||||||||
| Climate Zone | U-Factor1 | SHGC2 | |||||||||
| Northern | ≤ 0.45 | Any | |||||||||
| North-Central | ≤ 0.50 | ≤ 0.25 | |||||||||
| South-Central | |||||||||||
| Southern | |||||||||||
| Requirements for Swinging and Sliding Doors | |||||||||||
| Glazing Level | U-Factor1 | SHGC2 | |||||||||
| Opaque | ≤ 0.17 | No Rating | |||||||||
| ≤ 1/2-Lite | ≤ 0.23 | ≤ 0.23 | |||||||||
| > 1/2-Lite | ≤ 0.26 | Northern & North/Central | ≤ 0.40 | ||||||||
| ≤ 0.28 | Southern & South/Central | ≤ 0.23 | |||||||||
| 1. Btu/h ft2∙˚F | |||||||||||
| 2. Solar Heat Gain Coefficient | |||||||||||