Manual J Residential Load Calculation, 8th Edition

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:

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.