ACCA Manual J • Building-science HVAC design
Load Calculations (Manual J) for accurate, code-aligned system design
Manual J is the foundation for right-sized HVAC. Movement Energy Inc calculates room-by-room heating and cooling loads using California-relevant inputs—so your equipment selection, duct design, and Title 24 documentation are built on real data, not rules of thumb.
What we deliver
A Manual J report you can build from
We produce clear, defensible load calculations that support equipment sizing (Manual S), duct design (Manual D), and energy compliance workflows.
Room-by-room heating & cooling loads
Detailed sensible/latent loads by zone to avoid hot/cold rooms and oversizing.
California-relevant inputs & assumptions
Orientation, glazing, shading, insulation, infiltration, internal gains, and ventilation aligned to the project scope.
Design conditions & documentation
Clear design temperatures, notes, and deliverables that installers, designers, and HERS/Title 24 teams can reference.
Heat pump–ready sizing foundation
Loads that support modern electrification strategies and comfort-first system selection.
Why Manual J matters (and what it prevents)
Right-sized equipment
Avoid short-cycling, humidity issues, and unnecessary upfront cost from oversizing.
Better comfort in every room
Room-by-room loads inform airflow targets and zoning decisions—reducing hot/cold spots.
Stronger compliance & fewer surprises
Documented assumptions and loads help support Title 24-related workflows and change-order control.
Our process
How we build a defensible Manual J
We combine field verification (when applicable) with building-science inputs to produce loads you can trust.
1) Project intake & scope alignment
We confirm building type, conditioning goals, zoning, ventilation approach, and any compliance requirements.
2) Data collection
Plans and/or site data: floor areas, ceiling heights, envelope assemblies, windows/doors, shading, orientation, and duct location.
3) Modeling & load calculations
Room-by-room heating/cooling loads with transparent assumptions and design conditions appropriate for the project.
4) Deliverables & next-step recommendations
We provide the Manual J output and guidance for Manual S equipment selection and Manual D duct design (as needed).