Residential ACCA Manual J hvac design Knowledge FAQ & Resource center:  What is ACCA Manual J?  What is ACCA Manual S?  What is ACCA Manual D? 

ACCA Manual J Load Calculations Knowledge Base & FAQ: 

ACCA Manual S Equipment Verification Knowledge Base & FAQ:

ACCA Manual D Duct Design Knowledge Base & FAQ:

WrightSoft:

How Does ACCA Manual JSD Save Money?

HOW to submit a residential manual jsd project to savoy engineering group?

Manual J FAQ  - ACCA Manual J load calculations, the 1st step in the HVAC design process​

What is Manual J?

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 that greatly affect the choice of equipment and its capabilities are used in a Manual J calculation such as window size/type, insulation R-value in wall, floors and ceiling, duct location, and annual weather conditions for your homes location.  A Manual J designer must use the correct set of building materials, geographical location, orientation, infiltration, ventilation and internal gains to be accurate.    Manual J VIDEO: Please watch our video "What is an ACCA Manual J load calculation?"     READ More...​​

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Manual S FAQ  - ACCA Manual S HVAC selection, the 2nd step in the HVAC design process​

What is Manual S?

Manual S, Residential HVAC Equipment Selection, is the ANSI-recognized national standard providing clear instruction for interpreting and applying original equipment manufacturers' (OEM) expanded performance data.  The goal of Manual S HVAC sizing is to select an HVAC system that will maintain the design comfort conditions determined in the Manual J calculation.   The manufacturer’s OEM data is required to verify Manual S sizing has the correct CFM, EDB, EWB and outdoor temperatures.  AHRI data is inaccurate as it tests the unit at 80 F indoor and does not consider grains of moisture (humidity) for you city/area.  A properly sized HVAC prevents many problems such as excess expense, unnecessary wear, decreased comfort and marginalized performance.  READ More...

Manual D FAQ  - ACCA Manual D duct design, the 3rd step in the HVAC design process​

What is Manual D?

Manual D duct designis the ACCA calculation used to determine the supply and return duct lay-out including the individual duct branch sizes. Before designing the residential duct system, the HVAC designer should perform a Room by Room Manual J load calculation and complete Manual S HVAC selection using the manufacturer’s OEM data.  Manual D designs the duct system to distribute the right amount of heating and cooling air to each room and provide a low resistance path from each room back to the HVAC system.  Proper air distribution is critical to home comfort.   READ More...