A DOE Zero Energy Ready Home is a high performance home which is so energy efficient, that a renewable energy system can offset all or most of its annual energy consumption. For complete program information, see the Zero Energy Ready Home information on Energy.Gov .
Window Performance Information
All fenestration shall meet or exceed ENERGY STAR requirements.*
*Windows shall meet the applicable ENERGY STAR Window Product Criteria based on the following schedule:
- For projects permitted on or before 8/31/2015, windows shall meet ENERGY STAR Windows Eligibility Criteria Version 5.0
- For projects permitted after 8/31/2015, windows shall meet ENERGY STAR Windows Eligibility Criteria Version 6.0; except for Climate Zones 5 through 8 and Zone 4 Marine, which must follow ENERGY STAR Windows
- Eligibility Criteria Version 6.0 for projects permitted after 8/31/2016
See www.energystar.gov/products/building_products/residential_windows_doors_and_skylights for current ENERGY STAR Windows Eligibility Criteria. For homes achieving PHIUS+ certification where triple glazed window assemblies with thermal breaks/spacers between the panes are used, such windows are deemed to meet this requirement even in the absence of an ENERGY STAR certification.
*Fenestration shall meet the applicable ENERGY STAR Windows Eligibility Criteria for U and SHGC, with the following exceptions:
- An area-weighted average of fenestration products shall be permitted to satisfy the U-factor requirements;
- An area-weighted average of fenestration products ≥ 50% glazed shall be permitted to satisfy the SHGC requirements;
- 15 square feet of glazed fenestration per dwelling unit shall be exempt from the U-factor and SHGC requirements, and shall be excluded from area-weighted averages calculated using a) and b), above;
- One side-hinged opaque door assembly up to 24 square feet in area shall be exempt from the U-factor requirements and shall be excluded from area-weighted averages calculated using a) and b), above;
- Fenestration utilized as part of a passive solar design shall be exempt from the U-factor and SHGC requirements, and shall be excluded from area-weighted averages calculated using a) and b), above. Exempt windows shall be facing within 45 degrees of true South and directly coupled to thermal storage mass that has a heat capacity > 20 btu / ft3x°F and provided in a ratio of at least 3 sq. ft. per sq. ft. of South facing fenestration. Generally, thermal mass materials will be at least 2 in. thick.
Download the Program Requirements Document (v5) for all the necessary information for meeting the peformance requirments.