About Manual J Knowledge Center
Residential HVAC Design Education Backed by Experience Since 2005
ManualJKnowledgeCenter.com helps homeowners, builders, and HVAC professionals understand residential HVAC design—from calculating heating and cooling loads to selecting equipment and designing ductwork. We explain Manual J, Manual S, and Manual D in practical language so readers can ask better questions and make informed decisions about their home's HVAC system.
ACCA Manual J, S & D Experience & Education
Meet Tracy Savoy
The Knowledge Center draws on the residential HVAC design experience of Tracy Savoy, owner of Savoy Engineering Group and Load-Calculations.com.
Tracy has worked with residential HVAC calculations and duct designs since 2005. Her background includes a Bachelor of Science in Mechanical Engineering and a Master of Science in Engineering Management. She completed ACCA Manual J, S, and D certification training in 2012 and has participated in repeated Wrightsoft training, including advanced Manual D coursework.
Her early experience included small-duct high-velocity designs for Unico Systems and beta testing Wrightsoft's Right-HV duct module. Today, Savoy Engineering Group provides residential Manual J, S, and D services nationwide through Load-Calculations.com.
Why This Knowledge Center Exists
Why This Manual J Knowledge Center Exists
HVAC terminology can make a straightforward question feel complicated: What does this home actually need?
This site helps readers understand the information behind that answer—from insulation and windows to equipment performance and duct airflow. It also explains why complete project information, coordination with the installer, and local permit requirements matter.
Our Educational Approach
Our Approach to Residential HVAC Design Education
We explain each step separately, then show how the steps work together:
- Manual J—Calculate the home's heating and cooling loads.
- Manual S—Select equipment using those loads and manufacturer performance data.
- Manual D—Design the duct system to distribute the required airflow.
Articles use practical explanations, figures, and project considerations. We distinguish general guidance from requirements that must be confirmed with a local permit office or information that must come from the equipment manufacturer.
Why Manual J Matters
Why Manual J Matters in Residential HVAC Design
A home's heating and cooling needs depend on more than floor area. Construction details, windows, insulation, air leakage, orientation, and climate all affect the calculation.
Manual J provides the starting point for informed equipment selection. Manual S and Manual D carry that information into equipment and duct decisions. Understanding this sequence helps homeowners recognize why a complete design requires more than choosing a nominal equipment size.
Education and Professional Services
Residential HVAC Design Education & Services
ManualJKnowledgeCenter.com provides residential HVAC design education. Professional residential Manual J load calculations, Manual S equipment selection, and Manual D duct design services are available through Savoy Engineering Group at Load-Calculations.com, serving projects nationwide.
Savoy Engineering Group's services are residential HVAC calculations, equipment selection, and duct design. Engineering services, MEP services, and stamped reports are not offered.
Get a Price Quote & Order Our Manual J, S & D Services
Review professional residential Manual J, S, and D services, pricing, and ordering instructions at Load-Calculations.com.