ARLINGTON, Va. — ACCA has announced the release of Addendum E to ANSI/ACCA 2 Manual J – 2011, which updates the weather data contained in Manual J®.

The addendum underwent an American National Standards Institute (ANSI) public review period (Aug. 29, 2014 – Oct. 13, 2014) and was ANSI-recognized on Oct. 20, 2014. The addendum updates the weather data values for outdoor design conditions in MJ8 Table 1A and Table 1B and provides a new degree day ratio (HDD base 65°F / CDD base 50°F) column. The purpose of the changes are to provide the most recent weather data by consolidating information from two separate authoritative sources and to present HDD/CDD ratios as required in ANSI/ACCA 3 Manual S® – 2014 for the optional heat pump selection and sizing procedure. This proposed revision has no effect on the underlying Manual J or Manual S procedures that use weather data values.

The information in Addendum E will be added to a future printing of Manual J. In the interim, you can download a free PDF copy (65 pages) of Addendum E at For questions about Addendum E, contact Luis Escobar, ACCA’s manager of codes and standards, at

Publication date: 11/10/2014

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