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Introduction to Manual J load calculations and why they are important

Overview of Manual J

Manual J is designed to be used only for residential buildings that have three or fewer above-grade stories

Can I use Manual J for commercial buildings?

How design conditions are set automatically and how they can be adjusted per local code requirements

Design conditions - automatic settings and making edits

Set the construction, attic venting, roof material, and insulation so ceiling heat gain and loss are calculated correctly.

Ceilings - verify and edit

Set the construction type, tightness, wall insulation, floor insulation and finish so floor heat transfer is calculated correctly.

Floors - verify and edit

How to set infiltration load calculations with the tightness or blower door method

Air infiltration - verify and edit

How to model losses and gains for ductwork in unconditioned space

Ducts - verify and edit

Learn more about occupant, appliance and plant loads found in the Building Profile

Internal loads - verify and edit

Use a flash light, lighter or laser to quickly verify glass type

How to determine if you have "low-e" or "clear" windows

Learn how we set starting assumptions using the year built and location of a home

Smart starting assumptions for insulation, windows and air leakage

Eric Fitz

Verify and edit key home construction details for accurate designs

Manual J (Load Calculations)

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