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Draft PDS-01, BSR/RESNET/ICC 301-202x

Proposed Standard BSR/RESNET/ICC 301-202x will be the 3rd edition of Standard ANSI/RESNET/ICC 301, Standard for the Calculation and Labeling of the Energy Performance of Dwelling and Sleeping Units using an Energy Rating Index. The new edition will include all addenda and interpretations of the 2019 edition and provide additional clarifications. Standard ANSI/RESNET/ICC 301-2019 Addendum A-2019 updates the Standard for consistency with current energy ratings for clothes washers and dryers and dishwashers. Standard ANSI/RESNET/ICC 301-2019 Addendum B-2020 incorporates calculations for HVAC quality installation grades determined according to new Standard ANSI/RESNET/ACCA/ICC 310-2020. The significant changes proposed in the draft in addition to those in the Addenda and interpretations are as follows:

  1. Section 3: New definitions
  2. Attic
  3. Bathroom
  4. Cooling Load, Sensible
  5. Heating Load
  6. Hot Water Load
  7. Load
  8. Section 3: Revised definitions
  9. Energy Rating Index
  10. Energy Rating Reference Home
  11. Multifamily Buffer Boundary
  12. Purchased Energy
  13. Unrated Heated Space
  14. Section 4: Changed from “end use loads” (EL) to “energy consumption” (EC) where appropriate
  15. Section 4: Separated ventilation energy consumption end use from Lights & Appliances
  16. Section 4, Table 4.2.2(1): Clarified multifamily boundary condition assumptions
  17. Multifamily buffer boundary
  18. Above grade walls
  19. Ceilings
  20. Floors
  21. Section 4, Table 4.2.2(1), Table 4.2.2(4): updated/clarified solar absorptance values for walls
  22. Section 4, Table 4.2.2(2): Reference home basement wall insulation clarification (R vs U)
  23. Section 4, Table 4.2.2(1): Clarifications and improvements on air exchange rates and ventilation energy calculations for reference/rated homes
  24. Section 4, Table 4.2.2(1), note “aa”: Duct area is now a MRF, with default calculations
  25. Section 4, Table 4.2.2(1), note “x”: a substantive change to allow duct leakage testing defaults for ducted systems less than 10 ft (DSE=1) and an option to model 4cfm25/100ft2 if and only if all ducts and equipment are inside CSV, don’t use building cavities as ducts and also not located in assemblies adjacent to the exterior or USV
  26. Clarification of “General water use” internal gains
  27. HVAC Installation Quality clarifications (generally minor)
  28. Equations 4.2-22 and 4.2-24: Change QDEV to FAF
  29. Equation 4.2-26: Add minimum mains water temperature of 32F (moved from Publication 002)
  30. Equation 4.2-39b: more equitable distribution of shared pump energy (pro-rate by bedroom not dwelling unit)
  31. Section criteria: Fix error in IAF criteria within the HVAC installation grading section by deleting Table 4.2.2(6) and changing “Grade I” to “Grade III”.
  32. Section 4.4.1: Revised programmable thermostat algorithm to ramp up 1 degree per hour to accommodate more realistic heat pump behavior (avoiding triggering of resistance heat)
  33. Section 5, Table 5.1.2 (1): Fix national average emission factors for household fuels
  34. Minor editorial changes


Appendix A:

  1. Correct air permeance values; change 0.04 to 0.004

Appendix B:

  1. Formatting changes to break up large paragraphs into specific points
  2. On-Site Inspection Protocol

o   Photo documentation photo of mechanical ventilation system added

  1. Floor/Foundation Assembly

o   Measurements to the nearest foot instead of ½ foot

  1. Wall / Roof Assembly

o   Modeling guidance for through-wall AC & PTAC units

o   Improved guidance for determining the Framing Fraction for ceilings, floors, and walls.

o   Improved guidance for determining assembly color and associated solar absorptance

  1. Windows

o  Additional resources to find information on window U-value and SHGC

  1. Hot water distribution

o   Improves text associated with the on-site inspection protocol

  • Measurements of pipe lengths
  • Determining the flow of faucets etc.

This first draft, PDS-01, of BSR/RESNET/ICC 301-202x is submitted for public comment for 60 days. The changes shown in draft PDS-01 by strike-through and underline and red print are open for comment. To review and comment on the Draft follow the links below.

Draft PDS-01, BSR/RESNET/ICC 301-202x

Comment on Draft PDS-01, BSR/RESNET/ICC 301-202x

View comments on Draft PDS-01, BSR/RESNET/ICC 301-202x

The public comment period will be open for 60 days from December 18, 2020 through February 16, 2021. Comments will be accepted only on text in draft PDS-01 shown by strike-through and underline and in red print.


Tips and Reminders for Submitting Public Comments 

  • Comments must pertain to text in draft PDS-01 that is shown as either strikethrough or underlined and red print. Comments on portions of draft PDS-01 where no change is indicated will be rejected.
  • Comments must include a specific proposed change to the text of the draft open for comment. Proposed added text must be underlined and text proposed to be removed must be shown using strike-through. If not submitted in this format, the public comment may be rejected.
  • Do not submit comments on standards other than this one that is out for public comment.
  • If you submit public comment representing the collective interests of a group of stakeholders, you are encouraged to submit ONE public comment and identify all stakeholders in that comment. While not required, this expedites the ability of the committees to respond to commenters in a timely manner.
  • Public comments are reviewed by committees with volunteer members, that are Raters, Providers, Software Developers and other industry and public interest stakeholders. They are not reviewed by RESNET Staff.
  • Most amendments to RESNET standards are proposed by industry and public stakeholders not RESNET. To learn more about submitting proposed amendments visit this page: https://www.resnet.us/about/standards/submit-proposed-amendments/