ACCA Publishes Understanding Manual J Guidebook

May 24, 2016

ACCA, the Indoor Environment & Energy Efficiency Association, published Understanding J Manual®, a companion guidebook to help contractors understand the standard and perform load calculations properly.

"Because load calculations are such an important part of designing a system that functions properly and provides optimal comfort to homeowners and their families, Manual J is a complicated procedure that can be difficult to understand," said Paul T. Stalknecht, ACCA president and CEO. "That is why ACCA developed this companion book. Manual J is the national standard for residential load calculation and is required by most building codes throughout the country. We want to make sure that contractors can meet the code requirements and serve their customers to the best of their ability."

Understanding Manual J is not a replacement for the original standard, but a resource to help you and your technicians fully understand how to run a load calculation.

Those interested in Understand Manual J can download the table of contents and the first chapter of the book at

Understanding Manual J is available in the ACCA Store at or by calling 888-290-2220.


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ACCA is a non-profit association serving more than 60,000 professionals and 4,000 businesses in the indoor environment and energy services community. Our member firms are the nation's most professional contracting businesses, serving residential and commercial customers in every state. With roots stretching back a century, ACCA was incorporated in its present form nearly 50 years ago. Today, ACCA sets the standards for quality comfort systems, provides leading-edge education for contractors and their employees, and fights for the interests of professional contractors throughout the nation. Learn more about ACCA here.