ACCA is an ANSI-accredited standards developer that develops standards and supports the American National Standards Institute (ANSI). ANSI approval of ACCA manuals, procedures and processes verifies that the principles of openness and due process have been followed in developing these materials, and that a consensus of those directly affected by the standards has been achieved.

ACCA’s standards activity is overseen by our Standards Task Team, which forms subcommittees as needed to oversee specific standards development. The process is open and you are encouraged to get involved; for more information, contact standards-sec@acca.org.

CURRENT ACTIVITIES

ACCA ANNOUNCES ANSI PUBLIC REVIEW FOR PROPOSED REVISIONS TO MANUAL D® – 2016, RESIDENTIAL DUCT SYSTEMS 

Alexandria, VA (July 3, 2025) - The Air Conditioning Contractors of America Educational Institute (ACCA-EI) Standards Task Team (STT) announces an American National Standards Institute (ANSI) public review period for proposed revisions to ANSI/ACCA 1 Manual D® –2016, Residential Duct Systems, as a revised industry standard.

The 30-day ANSI public review period will be from July 4, 2025, with a comment deadline of August 3, 2025.

This is the 3rd public review for proposed revisions to Manual D – 2016, and only involves the addition of three missing pages that were inadvertently omitted from the two previous public review drafts. The missing pages are found in Section N4. Fitting Equivalent Lengths; and are unchanged from the 2016 edition.

Manual D provides requirements and calculations for sizing residential HVAC duct systems, including return and supply ducts & registers, to distribute the correct amount of heating and cooling to each room based on the ACCA Manual J load calculation results.

A copy of the three missing pages can be obtained by going to the link shown below. Comments can be submitted by filling out and submitting the form at the same link.

ACCA ANSI Public Response Form - ACCA

For more information about Manual D® or ACCA, please contact Kate Wessels, ACCA vice president of communications, marketing, and partnerships at kate.wessels@acca.org or 703-824-8864.

Member Input Needed – ACCA Reviewing Several of its ANSI Recognized Standards for Potential Updates 

ACCA has begun the process to review several of its current standards that are recognized by the American National Standards Institute (ANSI).  According to ANSI’s Essential Requirements, once a standard is approved it must be reviewed every 5 years to determine whether it requires (a) additional changes or updates, (b) reaffirmation if no changes are needed, or (c) withdrawal. 

Member Input Needed – ACCA has proposed Addendum c to Manual S 

The Air Conditioning Contractors of America Educational Institute (ACCA-EI) Standards Task Team (STT) announces an American National Standards Institute (ANSI) public review period for proposed “addendum c” to ANSI/ACCA 3 Manual S® –2023, Residential Equipment Selection, as a revised industry standard.

The 45-day ANSI public review period will be from June 6, 2025, to July 21, 2025. Proposed Addendum c will supplement ANSI/ACCA 3 Manual S® –2023, and Addendum an and b – 2024.

The proposed addendum is to further clarify the existing requirements, correct some errors, and to address user experience. Manual S® provides procedures for selecting and sizing residential cooling equipment, heat pumps, electric heating coils, furnaces, boilers, ancillary dehumidification equipment, humidification equipment, and direct evaporative cooling equipment.

A redline review draft of the proposed addendum can be obtained by going to the link shown below. Comments can be submitted by filling out and submitting the form at the same link.

ACCA ANSI Public Response Form - Proposed Addendum C to Manual S® 

In conjunction with ACCA's review, if you have any changes or additions to offer on any of the above standards, please contact standards-sec@acca.org.

ACCA-EI Standards Task Team

For the latest standards developments being undertaken by the Standards Task Team, please view the updated ANSI/ACCA Standards Development Schedule by clicking here.

Meeting Minutes

• March 12, 2024
• April 3, 2023
• March 28, 2022
• March 24, 2020
• March 5, 2019
• February 13, 2018
• March 21, 2017
• March 10, 2016
• March 16, 2015
• March 17, 2014
• February 28, 2013
• March 6, 2012
• February 16, 2011
• March 9, 2010
• March 19, 2009
• February 7, 2008
• March 12, 2007
• March 29, 2006
• March 10, 2005
• February 25, 2004
• March 15, 2003
• March 1, 2002

Standards Task Team Roster.

Submit this form to propose a standard for consideration by ACCA.

Submit this form if you are interested in serving on the STT and would like to nominate yourself for consideration by ACCA.

This document outlines the operational and organizational guidelines for ACCA ANSI standards.

New project notification for proposed addenda to ACCA Manual S® - 2023, Residential Equipment Selection

The Air Conditioning Contractors of America Educational Institute (ACCA-EI) Standards Task Team (STT) has announced an American National Standards Institute (ANSI) project notification for a proposed addendum to ANSI/ACCA Manual S® - 2023, Residential Equipment Selection.

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