Problem: Your construction company doesn’t have an HVAC expert on staff, making it difficult to provide accurate Manual J calculations for client homes.

Solution: This guide outlines key steps for to order Manual J calculations as a service, helping you ensure proper heat gain and heat loss calculations and optimal energy savings for clients.

1. Understand Manual J:

  • It may be a mandatory requirement for contractors in your program.

  • It calculates a home’s heating and cooling needs based on building information, location, and orientation.

  • The software uses data input, so accuracy is crucial.  PDF plans, jobsite address, and square footage are vital to every Manual J.

2. Manual J Service

  • is a Manual J service provider that offers Manual J heat loss for only $79 in 4-6 hours.

  • Choose a Manual J service that offers free modifications in case your project changes.

3. Why Accuracy Matters:

  • Proper heat loss and heat gain Manual J calculations impacts air quality, ventilation, and humidity control.

  • An oversized unit short cycles, wasting energy and increasing humidity.

  • An undersized unit constantly runs, drawing high energy and drying out the air.

4. Quality Control Checks:

  • Building department: The building department will review your Manual J calculations and compare them to your plans and what was constructed.

  • Data Input Verification: This is where you can play a key role!

    • Basic Design Conditions:

      • Verify the weather station location is close to the house.

      • Ensure indoor design temperatures are set appropriately (e.g., 68°F winter, 78°F summer).

    • Construction Quality:

      • Construction Descriptions: These should be present throughout your plans and used within your Manual J heat loss.

        • Walls, Floors, Ceilings: Verify insulation levels are accurate post-weatherization.

        • Windows, Doors: These are key components that will be on your Manual J report.

  • Visual Checks:

    • Review the provided Manual J printouts for specific data points mentioned above.

    • Pie charts can help visualize where the heating/cooling load originates.

5. Recommendation Summary:

  • Manual J calculations are essential, and ensuring accuracy is crucial.

  • Empower your staff to perform data input verification checks.

  • Don’t hesitate to investigate further if anything seems off.

  • By taking these steps, you can ensure your clients receive the right-sized HVAC system for optimal comfort and energy savings.

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Email order number, PDF Plans, jobsite address, and square footage to