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Manual J Residential Load Calculation, 8th Edition

Manual J Residential Load Calculation, 8th Edition

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Manual J 8th Edition is the national ANSI-recognized standard for producing HVAC equipment sizing loads for single-family detached homes, small multi-unit structures, condominiums, town houses, and manufactured homes. A proper load calculation, performed in accordance with the Manual J 8th Edition procedure, is required by national building codes and most state and local jurisdictions.


MJ8 produces equipment sizing loads for single-family-detached homes, small multi-unit structures, condominiums, town houses and manufactured homes.

Manual J8 provides detailed requirements for producing a residential load calculation per the CLF / CLTD method. The provision of the standard apply to any dwelling unit that has its own heating-cooling-ventilating system and equipment, and its own exhaust air system(s). This includes:

  • Single family detached structures, duplex structures, and triplex structures;
  • Single family attached structures (row house or town house);
  • Dwelling units in multi-family attached structures (condo and apartment units); and
  • Energy efficient homes.

    Manual J8 divided into two portions: normative and informative. Parts N (Normative Requirements) and 4 (Normative Tables) contain the minimum requirements for conducting a residential load calculations. Informative Parts 1, 2, 3, and 5 contain additional explanation, details, and examples that clarify the normative requirements.


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