Residential Load Calculation Manual J Eighth Edition Version 250 Author:P.E., Air Conditioning Contractors of America, Hank Rutkowski Manual J 8th Edition is the national ANSIrecognized standard for producing HVAC equipment sizing loads for singlefamily detached homes, small multiunit 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 a... more »nd most state and local jurisdictions.« less