Wrightsoft Right-J is the most widely used Manual J program in residential HVAC. Independent 2026 comparisons put it at roughly 27 percent of the contractor market, ahead of every other tool, and it runs about 695 dollars per year for a single seat. If a plan reviewer, a utility program, or a general contractor tells you the load calculation has to come from ACCA-approved software, Right-J is almost always on the short list of names they will accept. This article walks the actual Manual J workflow in Right-J, from a blank project to the report set you hand a permit office, and flags the few places where contractors most often introduce errors.
What Wrightsoft Right-J Is (and the Two Ways You Run It)
Right-J is the Manual J load-calculation module inside Wrightsoft's Right-Suite Universal package. Right-Suite Universal bundles the load calc with the matching ACCA procedures around it: Right-S for equipment selection (Manual S), Right-D for duct design (Manual D), and Right-Draw, the drag-and-drop drawing tool the vendor markets as the way to "produce your load in seconds." The idea is that one drawing of the house feeds Manual J, then Manual S, then Manual D without re-entering the geometry three times.
There are two products carrying the Right-J name, and the difference matters before you buy. Right-Suite Universal is a Windows desktop application; Wrightsoft states plainly that it is a Windows-based solution and that iOS users would need a Windows emulator such as Parallels to run it. Right-J Mobile is the separate, web-based version: the vendor describes it as generating ACCA-approved Manual J8 whole-house residential block loads with eight accompanying reports, from any browser. Desktop gives you the full integrated J/S/D suite and the deepest control; the web version gives you a lighter, install-free path to a compliant whole-house block load. Pick based on whether you need the full duct-and-equipment workflow or just the load number for a permit.
The ACCA-Approved Detail That Decides Permit Acceptance
Before you rely on any tool for a submittal, understand what "ACCA-approved" actually means, because it is the thing a plan reviewer checks. ACCA publishes a list of load-calculation programs it has validated as compliant with the Manual J standard, and Right-J from Wrightsoft is on it, alongside RHVAC from Elite Software, Cool Calc, AccuLoads from ADTEK, EnergyGauge from the Florida Solar Energy Center, and a handful of others. ACCA has cautioned that using software outside its approved set may not be considered Manual J compliant and can create liability for the contractor, so the approved-list status is not a marketing nicety, it is the basis for permit acceptance.
The current residential standard is Manual J 8th Edition, usually written MJ8. Right-J Mobile explicitly advertises Manual J8 block loads, and desktop Right-J computes to the same edition. When a jurisdiction or program specifies "ACCA Manual J," it means MJ8, and a Right-J report satisfies that on its face. If you have any doubt about a specific office, confirm the accepted software and edition with the authority having jurisdiction before you submit, since local amendments do exist.
The Step-by-Step Right-J Manual J Workflow
The exact menu labels shift between Right-Suite Universal builds, so treat the sequence below as the procedure rather than a click-by-click script, and confirm the current wording against your installed version. The order is what matters, because Manual J is a garbage-in, garbage-out procedure.
- Start the project and set the design conditions. Create a new job and set the location. Right-J pulls the outdoor summer and winter design temperatures for that location from the Manual J weather data, and you set the indoor design conditions (commonly 75F cooling and 70F heating, with a target indoor relative humidity). These design conditions, not the record extremes, are the temperatures the whole load is built on, so getting the location right is the single highest-leverage input.
- Draw the house in Right-Draw, or enter it room by room. Use the drag-and-drop Right-Draw canvas to lay out the footprint, walls, and rooms, or enter each room's dimensions directly. Working room by room from the start is worth the extra minutes: per-room loads are what Manual S equipment selection and Manual D duct design downstream actually depend on, and a whole-house-only block load cannot be zoned later.
- Assign construction assemblies from the libraries. This is where accuracy is won or lost. For each wall, ceiling, floor, window, and door, pick the matching assembly from Right-J's material libraries so the correct U-values and shading coefficients are applied. Match the real house: 2x6 walls with R-21, a specific window U-factor and SHGC, the actual attic insulation. A default assembly that does not match the building is the most common source of a wrong load.
- Set orientation, glazing, infiltration, and internal gains. Orient the plan correctly so window solar gains land on the right exposures, then confirm glazing area per room, the infiltration or tightness assumption, and the internal gains (occupants and appliances). On cooling loads especially, orientation and glazing drive a large share of the answer.
- Calculate the Manual J8 loads. Run the calculation. Right-J returns the whole-house block load plus the room-by-room heating and cooling loads in BTU per hour, computed to the MJ8 procedure. This is the number that sizes the equipment.
- Review the construction component report to troubleshoot. Right-Suite Universal produces a construction component report that breaks the load down by room and by building material, which lets you see exactly which walls, windows, or infiltration assumptions are driving a room that looks too high or too low. Use it to sanity-check before you trust the totals: a bedroom carrying an implausible cooling load usually traces back to a wrong window or orientation here.
- Carry the load into Right-S and Right-D. With the load verified, move into Right-S to select equipment whose capacity matches the Manual J load rather than exceeding it, and into Right-D to size the duct system to the per-room CFM. Because the geometry is shared, this is where the integrated suite saves the time it advertises.
- Export the report set for the permit. Generate the professional report package (Right-J Mobile lists eight accompanying reports) and export the Manual J load report a reviewer expects: project summary, design conditions, and room-by-room loads. That document, sourced from ACCA-approved software, is what goes in the permit file.
Right-J Desktop or Right-J Mobile: Which One
Choose Right-Suite Universal desktop when you regularly do full designs and want Manual J, S, and D in one shared model, plus the deepest library and reporting control. It is Windows-only, so a Mac shop needs an emulator. Choose Right-J Mobile when you mainly need a compliant whole-house block load, want to work from a browser on any machine, and do not need the integrated duct and equipment tools in the same environment. Both compute to MJ8; the split is about workflow depth and platform, not about whether the load is valid.
Where Right-J Loads Go Wrong
- Do set the location before anything else. The outdoor design temperatures come from it, and every downstream number scales with them.
- Do match assemblies to the real building. Library defaults are a starting point, not the house; verify U-values, R-values, and window SHGC against what is actually installed.
- Do go room by room. Per-room loads are required for honest Manual S and Manual D; a block-only load boxes you in.
- Don't oversize from the total. Size equipment to the Manual J load through Manual S, not by padding capacity for a comfort margin, which causes short cycling and poor humidity control.
- Don't skip the component report. A five-minute review of the per-room breakdown catches the orientation and glazing mistakes that a bare total hides.
FAQ: Wrightsoft Right-J and Manual J
Q: Is Wrightsoft Right-J ACCA-approved for Manual J?
A: Yes. Right-J appears on ACCA's list of load-calculation programs validated as compliant with the Manual J standard, and it calculates to the current 8th edition (MJ8). A Right-J report is accepted as ACCA Manual J for permit purposes; when a specific office is strict, confirm the accepted software with the authority having jurisdiction before submitting.
Q: What is the difference between Right-J and Right-Suite Universal?
A: Right-J is the Manual J load-calculation module. Right-Suite Universal is the full package that bundles Right-J with Right-S (Manual S equipment selection), Right-D (Manual D duct design), and the Right-Draw drawing tool, so one drawing of the house feeds all three ACCA procedures.
Q: How much does Right-J cost?
A: Independent 2026 comparisons list Right-J at about 695 dollars per year for a single seat, the priciest of the mainstream options but also the most widely used at roughly 27 percent market share. Check Wrightsoft's site for current pricing and seat terms, since renewals and bundles change.
Q: Can I run Right-J on a Mac?
A: Right-Suite Universal is a Windows desktop application; Wrightsoft states that iOS or Mac users need a Windows emulator such as Parallels to run it. If you want to avoid an emulator, Right-J Mobile is the web-based version that runs from any browser and produces an MJ8 whole-house block load.
Q: Is Right-J more accurate than a free tool like Cool Calc?
A: Not inherently. Every ACCA-approved engine runs the same Manual J procedure, so correct inputs yield the same load regardless of the tool. What differs is workflow: Right-J's integrated Right-S and Right-D and its detailed libraries suit high-volume design shops, while a free browser tool can be enough for occasional loads. Many contractors keep more than one option available. Our own CoolCalc walkthrough covers the free web-based alternative if you want to compare.
Q: Does the Manual J load also tell me which equipment to buy?
A: The Manual J load is the input to Manual S, which is the step that actually selects equipment sized to the load rather than oversized. After sizing, matching efficiency ratings to the equipment is a separate decision; our guide to SEER, SEER2, EER, and HSPF explains what those numbers mean once the capacity is set.
Q: Do I need a Manual J for a heat pump rebate or clean-heat program?
A: Usually, yes. Right-sizing is central to heat-pump incentive programs, and a Manual J load calculation is how you prove the equipment is sized to the home rather than oversized. If you are working within a state incentive like the NYS Clean Heat Program, an accurate MJ8 load from approved software is the document that supports the sizing.
Prefer to hand the whole load calculation off to a specialist? Contact Manual J Pro today for a permit-ready Manual J, S, and D report sized precisely to the home.