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During a Manual J calculation, contractors take measurements and perform tests to find the HVAC capacity of a building where they're installing a new HVAC unit. Our enhanced Manual J load calculator is now powered by Cool Calc's innovative software. This dynamic integration lets you create fast, efficient ACCA approvedStandards and protocol developed by Air Conditioning Contractors of America (ACCA) for the proper design and installation of HVAC equipment and duct work. Manual J is a calculation of your home's heating and cooling requirements as required by building codes to obtain an HVAC. A variety of home building factors These instructions use standard forms and worksheets found in Manual J and Manual D. The AHJ software follows the procedures in ACCA design manuals. Manual J allows contractors to perform a load calculation on a residential building/home. Apart from the load calcu- lation being performed, the ducts must be CoolCalc Manual J is a web based, ACCA approved MJ8 heating and cooling load calculator that allows you to do accurate load calculations in less time and What is ACCA Manual J load calculations? ACCA Manual J calculates the heating and cooling needed for each room based on your homes location, insulation and