Manual J

Manual J is the ACCA (Air Conditioner Contractors of America) approved method of calculating room-by-room and whole house cooling loads.  By following the Manual J methodology, KCG analyst are able to accurately determine the total amount of heat that is lost through the exterior of a home during the cooler months, and the total amount of heat that is gained through the exterior of a home during the warmer months.
Through a complex series of calculations and inputs, we are able to analyze all aspects of the thermal characteristics of every wall, floor, ceiling, door and window. In addition, an HVAC load calculation also takes into consideration other factors such as the home’s geographic location, orientation to the sun, envelope tightness, duct leakage, lights and appliances. ACCA’s Manual J even calculates the amount of heat and humidity that each occupant of the house will add to the interior of the home.
There are two types of Manual J load calculations:

    • Whole House (Block) HVAC Load Calculations
      Whole House or Block HVAC Load Calculations provide the heating and cooling loads for the entire home. This type of load calculation is used when there is no need to design or modify an existing duct system. Whole house load calculations are commonly used to determine the correct HVAC equipment size and match-up that is required when replacing the HVAC system in an existing home.
    • Room-by-Room Load Calculations
      Room-by-Room Load Calculations provide the heating and cooling loads for each individual room within the home. In addition to the information produced by a block load calculation, the Room-by-Room method also determines the amount of air that is required to heat and cool each individual room. This information is critical when determining the individual duct sizes as well as the size and overall layout of the duct system.

     

 



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