HVAC Load Calculation Software: Manual J Comparison (2026)
For residential HVAC load calculations, compare the specific Manual J product, its supported calculation scope, device requirements, and reporting workflow. Cool Calc offers browser access with per-project or subscription pricing. Wrightsoft has desktop and mobile products with different capabilities. Elite offers Rhvac desktop and online licenses. Check ACCA's current approval list and local submission requirements before choosing.
Choosing HVAC load calculation software starts with the work you need to complete: a whole-home load, room-by-room loads, equipment selection, or a duct design. A convenient phone app and a desktop design package may produce different deliverables even when both belong to the same vendor.
This comparison covers three residential options using their published specifications and prices, checked October 5, 2026. It is a documentation review, not a hands-on accuracy or speed benchmark. We have not ranked the tools by market share or permit acceptance rate.
Manual J software comparison
| Product | Access and workflow | Published price checked for this guide |
|---|---|---|
| Cool Calc | Browser workflow for Manual J, S, and D; optional LiDAR capture | $45 per project; Pro displayed at $50 per user per month with annual billing |
| Wrightsoft | Windows Right-Suite Universal and separate mobile/cloud products | Right-Suite Universal Residential, US version: $900/year; confirm add-ons separately |
| Elite Rhvac | Windows desktop or browser-based Rhvac Online | Desktop Rhvac 10: $599 permanent license; Online: $239/year for customers without the desktop product |
These are different license types. Compare the number of users, paid projects, required modules, support, upgrades, and report access before treating one headline price as the lowest total cost. Vendor prices can change.
What Manual J, S, and D each do
ACCA’s technical manuals separate three parts of residential design:
- Manual J: calculate heating and cooling loads.
- Manual S: select equipment using the loads and relevant performance data.
- Manual D: design the duct distribution system.
A load result does not by itself specify the equipment model or complete a duct design. Decide which deliverables your team will prepare and which, if any, another designer will supply.
The Department of Energy’s sizing guidance explains the importance of calculating loads instead of relying only on a sizing shortcut. Software still depends on the building information entered into it. Record the source of inputs such as dimensions, glazing, insulation, orientation, and design conditions so another person can review them.
Check the exact ACCA-approved product
The ACCA approved software list distinguishes full residential Manual J capabilities from block-load-only products. It lists Wrightsoft Right-J8, Elite Rhvac, and Cool Calc among options approved for block, room, and zone calculations. Right-J Mobile appears separately in the block-load-only category.
Approval belongs to the listed product and calculation scope. Do not assume that every app from a listed vendor has the same capabilities. Check the current entry and the product edition you intend to buy.
Permit requirements also depend on the local authority and project. Before purchasing, ask what calculations, forms, supporting data, and signatures it expects. Software approval alone does not guarantee acceptance of a particular submission.
Cool Calc: browser access and per-project pricing
Cool Calc is a candidate when you want to enter and review projects in a browser across devices. Its current site describes Manual J, S, and D, along with floor-plan, satellite, and LiDAR input options. Confirm device requirements if scanning is part of your intended workflow.
Is Cool Calc free?
Its current pricing page allows you to create an account and build a project before paying, but says payment is needed to see Manual J results. The page lists a $45 project option and an annual Pro subscription displayed as $50 per user per month. That is different from a free completed calculation or free permit report.
Check the current plan and any legacy account terms before budgeting. During evaluation, take a sample project through the result and report steps so you know exactly when payment is required and what the purchased output includes.
Wrightsoft: choose the desktop or mobile workflow deliberately
Wrightsoft’s current product lineup includes Windows Right-Suite Universal and mobile/cloud offerings. Its site lists the US residential desktop package at $900 per year, with Manual J and S loads and Manual D ducts. Confirm the modules and add-ons in your selected package.
Before buying, request a demonstration of the specific workflow you need: entering a home, reviewing room loads, choosing equipment, making a revision, and exporting the required reports. Check whether the package includes the drawing and duct-design functions you expect.
A team doing design work in the office may value a different interface from an advisor collecting information in a home. Have both roles review how a project moves between them. Do not assume that a mobile result replaces a full room-by-room design.
Elite Rhvac: desktop and online license choices
Elite publishes a $599 permanent desktop license for Rhvac 10 and a $239 annual Rhvac Online license for users who do not own the desktop product. Its listed desktop bundle with Drawing Board and Graphic Manual D Ductsize is $999. Check current upgrade and existing-customer terms separately.
Elite describes Rhvac Online as a browser-based, manual-entry version of the desktop workflow. Both cover Manual J, S, and D; drawing-related desktop options are separately identified on its product page.
Evaluate the interface your staff will actually use. A lower license cost can be offset by time spent entering, checking, revising, or transferring project information. Measure that time during a trial rather than assuming one vendor is faster.
Which HVAC load calculation app fits your work?
| Your requirement | What to check in a trial |
|---|---|
| Occasional residential calculations | Per-project cost, report access, and ability to reopen a revision |
| Room-by-room design | Approved calculation scope and a clearly reviewable room-load report |
| Field measurements on a phone or tablet | Supported device, input method, connection needs, and office handoff |
| Repeated office design work | Templates, revision handling, drawing tools, and export workflow |
| Load, equipment, and duct work in one project | Which J, S, and D functions are included in the selected license |
| Commercial projects | A product and methodology suited to the commercial building and project requirements |
This is a residential Manual J comparison. A commercial heat-load calculation should be evaluated against that project’s design requirements, rather than assumed to fit the residential tools listed here.
A sample-project checklist before paying
Use one project with known, documented inputs. This is a workflow evaluation, not an independent validation of the calculation engine.
- Enter the building and record assumptions that need confirmation.
- Check whether the required room or zone detail is available.
- Review a result with someone qualified to check the design inputs.
- Change a documented input and confirm how revisions are recorded.
- Export the reports your reviewer or local authority requests.
- Check how a second staff member opens and continues the project.
- Record license cost and staff time for that complete workflow.
Before selecting a subscription, estimate your expected paid projects and users. Keep occasional report costs separate from recurring seat fees. Ask about access to old reports if a subscription ends.
Carry the calculation into the quote
Attach the reviewed design to the job record and make the proposal consistent with it. The HVAC sales process should explain how the recommendation addresses the homeowner’s stated needs. If the distribution system needs work, use the ductwork estimating checklist to document the installation scope.
HVAC quoting software has a different role: presenting equipment, labor, exclusions, and commercial terms. Check the handoff between design and quoting so the homeowner and installation team receive the same approved scope.
Written by
PipelineOn Research Team