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Manual J Load Calculation Report
A Manual J Load Calculation Report documents the heating and cooling load calculation for a building, following the ACCA Manual J methodology. It is the foundation for proper HVAC equipment sizing and is required by most energy codes and many building departments.
ACCA Manual J (8th Edition), IECC (International Energy Conservation Code), state/local energy codesValid: One-off (no expiry)
What it covers
- Building envelope data (insulation, windows, infiltration)
- Design conditions (outdoor/indoor temperatures)
- Sensible and latent cooling loads
- Heating load
- Required airflow (CFM)
- Equipment sizing recommendations
Who needs a Manual J Report?
HVAC contractors
Building designers
Energy code compliance officers
Homeowners (new construction)
Create your Manual J Report with CertBox
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Frequently asked questions about Manual J Report
Is a Manual J required?
Yes. The IECC and most state energy codes require a Manual J (or equivalent) load calculation for new construction and major HVAC replacements. Many building departments will not issue a mechanical permit without one.
What is the difference between Manual J, D, and S?
Manual J calculates the heating/cooling loads. Manual D designs the duct system. Manual S selects the equipment. Together, they form the ACCA design process for residential HVAC systems.
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