ACCA Introduces The Eighth Version of Manual J

KISSIMMEE, FL — The Air Conditioning Contractors of America (ACCA) held a press conference at its 34th Annual Conference to provide a “sneak preview” briefing on Version 8 of Manual J, the industry standard for residential load calculation.

Manual J contains calculations for heat gain and heat loss for residential structures. The new version is its first major revision in 15 years. The updated Version 8 was a collaborative effort spearheaded by Hank Rutkowski, ACCA technical consultant, and Glenn Friedman, a technical consultant for Taylor Engineering, Alameda, CA.

“Given changes in efficiencies and construction, we needed a new process for load calculations,” said Friedman. “Manual J is the flagship of [ACCA’s] manuals and it has lacked the ‘sensitivity’ to keep up with modern technologies.”

Rutkowski has high praise for Version 8. “We have a product which has no competition from anything else in the world,” he said. “Manufacturers of sophisticated products ask us to put their product information into Manual J. In general, they support Manual J because they don’t want to see their equipment coming back because of failures [due to poor installations].

“The last thing that contractors needed was a more complex system of calculations. We had to tell contractors to wait for separate calculations, which weren’t available in Version 7.”


Friedman highlighted some of the new features at the trade media press conference. They include:

  • Peak load procedure involving energy usage at all times of the day, all year long.
  • NFRC glass added to calculations of “actual” heat loss via windows and includes window screens in calculations.
  • Dust load factor tables addressing the methodology of measuring dust loads.
  • Cfm requirements now include updated IAQ information.
  • Multiple-zone system calculations.
  • Version 8 will be available in CD format.

    “The revised Manual J is a business opportunity for contractors,” said Jim Hussey, ACCA 2002-2003 chairman. “It differentiates our contractors from others — it deals with correct load sizing.

    “Contractors have been drawn into the IAQ business and it is up to them to explain the benefits of a better-sized system.”

    Paul Stalknecht, president and ceo of ACCA, said Version 8 is just what contractors have been waiting for, and continues to be the “cornerstone of ACCA’s technical library.”

    “Everybody kept telling us to get Manual J out on the street,” he said. “We are challenged to get this information out to consumers, too. We want to make sure all of our manuals are ahead of the curve.”

    Version 8 of Manual J will soon be available. For more information or to order, visit (website).

    Publication date: 03/18/2002

  • Did you enjoy this article? Click here to subscribe to The NEWS Magazine

    Recent Articles by John Hall

    You must login or register in order to post a comment.



    Image Galleries

    2015 ACCA Conference

    Images from the 2015 ACCA Conference in Grapevine, Texas. Posted on April 8, 2015.


    NEWSMakers: Mark Crockett
    Mark Crockett vice president, Crockett Facilities Services, explains the importance of technician training, the value of being a top minority-owned company in the U.S., current projects the company is managing, and much more. Posted on April 24.
    More Podcasts


    NEWS 04-20-15 cover

    2015 April 20

    Check out the weekly edition of The NEWS today!

    Table Of Contents Subscribe

    Global Warming

    Do you believe in man-made global warming?
    View Results Poll Archive


    2015 National Plumbing & HVAC Estimator

    Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

    More Products

    Clear Seas Research


    Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.


    Magazine image
    Register today for complete access to Get full access to the latest features, Extra Edition, and more.


    facebook icontwitter iconyoutube iconLinkedIn i con