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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)

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Sample Manual J Report certificate

Sample Manual J Load Calculation Report certificate created with CertBox, showing the professional PDF layout with building envelope data (insulation, windows, infiltration), design conditions (outdoor/indoor temperatures), sensible and latent cooling loads

Sample Manual J Report with fictional data. All personal details shown are fake.

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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