Room-by-Room Loads, Not Square-Foot Guesswork
See how much heating and cooling each room actually requires before equipment and duct decisions are made.
Manual J Load Calculations
Manual J Load Calculations
Accurate room-by-room heating and cooling loads for properly sized residential HVAC systems.
Get Your Manual J
★★★★★
Trusted by HVAC contractors, builders,
architects, and project teams.
Engineered for comfort. Designed for performance.
Stop Guessing What Size HVAC System the Home Needs.
Manual J calculates the actual heating and cooling load so the system can be sized around the building, not a rule of thumb.
Start the HVAC Design With the Right Numbers
Use accurate room loads as the technical foundation for equipment selection, airflow planning, and duct design.
Very accurate calculations that made our HVAC sizing decision much easier.
★★★★★
90+ 5-Star Reviews
Manual J Load Calculations
Start at
$130
$100
SAVE $30
Accurate room-by-room heating and cooling load calculations needed to determine the HVAC capacity right for your home or project.
Get Your Manual J - $100Including
- Room-by-room heating loads
- Room-by-room cooling loads
- Sensible and latent loads
- Total volume heating load
- Total volume cooling load
- Duct system airflow summary
Get the HVAC Design Your Project Actually Needs.
Start with Manual J and avoid over-sizing, under-sizing, comfort issues, and callback costs.
Frequently Asked Questions
What is a Manual J calculation? +
Manual J is the ACCA-approved method for calculating
residential heating and cooling loads.
How is the report delivered? +
The completed report is delivered digitally
in a permit-ready format.
Why is Manual J important? +
It helps size HVAC equipment correctly instead
of relying on square-foot rules.
Is this accepted for permit submission? +
Manual J reports are commonly required by building
departments for residential HVAC permits.
What information do you need from me? +
Plans, project address, window details,
insulation values, ceiling heights, and
any proposed HVAC equipment.
How long does it take? +
Most reports are completed within 24 to 48 hours
after complete project information is received.
How It Works
1. Share Project Info
Upload plans and provide basic project details.
2. We Run Manual J
We calculate accurate room-by-room loads.
3. Review Your Report
You receive a detailed Manual J report.
4. Use With Confidence
Use the results for equipment selection and permits.
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