ACCA Approves CalcuNow as Manual J Block Load Compliant

March 12, 2015

ACCA, the nation’s largest organization of indoor environment and energy services contracting businesses, has recognized’s “Manual J Residential Block Load” online app as compliant with Manual J block load calculation procedures.

To become recognized, ACCA reviewed the app’s functionality, sensitivities, defaults, and capabilities to ensure that’s “Manual J Residential Block Load” meets the procedures and requirements of ANSI/ACCA 2 Manual J – 2011 (Residential Load Calculation).

The app is only recognized for “block loads” for existing home replacements where room-by-room loads are not required in accordance with ACCA Manual J 8th Edition.

ACCA continues to remind contractors that only software listed as approved by ACCA at is considered compliant with Manual J. Load calculation software and procedures that are not listed on that website cannot be considered to be properly observing Manual J’s procedures, methodologies, and defaults.

Manual J is a registered federal trademark of ACCA.


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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.