The reheat limitations were modified in the 2013 edition to require a reduction in flow to 20% in deadband, and were relaxed to allow up to 50% flow at peak heating. While the performance requirements have not changed, the standard will clarify that an inspection and verification program must be documented. And third, a new section was added that begins to address air-leakage inspections. Second, changes were made to the fenestration U-factor and SHGC, with some additional modifications made to the fenestration orientation provisions as well. First, minimum heating and cooling capacities that make a space fall into the "heated" or "cooled" categories were reduced. Of the many "in process" addendums, three stand out. The other change is that the envelope-only trade-off option rules were updated so one can use current whole-building energy simulation software. The standard expanded the areas where daylighting (called toplighting) is required in several large space types, and modified the way the window orientation/area provisions are calculated. Note, the window-to-wall ratio in 2012 IECC is 30%. The window-to-wall-ratio requirement, however, remained the same at 40%. Insulation values for wall and window U-factor and solar heat gain coefficient (SHGC) were made more stringent.
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