# LoadCalcStack

Independent directory of Manual J and ACCA-approved load-calculation software for HVAC contractors. Published pricing, tradeoffs, and cited sources. Not consumer AC repair. Not a generic HVAC FSM directory.

Written for HVAC contractors (career-changers and new owners) shopping Manual J / load-calc tools. Independent reviews. We do not run an HVAC company.

Author: LoadCalcStack editorial team

- HTML: https://www.loadcalcstack.com/
- Markdown: https://www.loadcalcstack.com/index.md
- Directory: https://www.loadcalcstack.com/directory
- Guides: https://www.loadcalcstack.com/guides
- ACCA approved software (authority): https://www.acca.org/standards/approved-software
- Methodology: https://www.loadcalcstack.com/methodology
- Affiliate disclosure: https://www.loadcalcstack.com/affiliate-disclosure
- Contribute: https://www.loadcalcstack.com/contribute
- llms.txt: https://www.loadcalcstack.com/llms.txt

## Seed vendors

### Conduit Tech

iPad-oriented HVAC load-calc and sales platform listed on ACCA's approved software page. Pricing is not published; you request a quote from the vendor.

- Pricing: Not published. Pricing page directs you to request a quote. No public dollar amount on vendor pages retrieved 2026-09-15.
- Billing model: Subscription (annual contract; monthly billing mentioned on solutions pages)
- Markdown: https://www.loadcalcstack.com/vendors/conduit-tech.md

### Cool Calc

Web-based Manual J, S, and D design suite with published unlimited subscription pricing and LiDAR scan options.

- Pricing: Unlimited Pro $50/user/mo. Also lists $250/user/mo suite plan and $45/project. Retrieved 2026-09-15.
- Billing model: Per user / month (plus per-project option)
- Markdown: https://www.loadcalcstack.com/vendors/cool-calc.md

### Elite Software (Rhvac)

ACCA-approved Rhvac residential load, duct, and equipment selection software with published desktop and online prices.

- Pricing: Rhvac 10 desktop $599 permanent. Rhvac Online $239/year (or $159/year if you already have Rhvac 10). Manual J Calculator Online $149/year. Retrieved 2026-09-15.
- Billing model: Perpetual desktop and/or annual online subscription
- Markdown: https://www.loadcalcstack.com/vendors/elite-software.md

### Wrightsoft

Windows-based Right-Suite Universal (RSU) residential package with published yearly subscription pricing covering Manual J/D and related design modules.

- Pricing: RSU Residential Package $900/year (USA). Canada $925/year; Combined USA & Canada $1,125/year. Retrieved 2026-09-15.
- Billing model: Annual subscription (USD)
- Markdown: https://www.loadcalcstack.com/vendors/wrightsoft.md


## Guides

- What is Manual J and ACCA-approved load-calc software? — Plain-language primer on ACCA Manual J residential load calculations and why contractors check ACCA's approved software list. No invented stats.

## Comparisons

- Cool Calc vs Wrightsoft — Side-by-side look at published pricing, platform, and ACCA Manual J positioning for Cool Calc and Wrightsoft RSU. No ranked winner.
- Cool Calc vs Elite Software (Rhvac) — Side-by-side look at published pricing, platform, and ACCA Manual J positioning for Cool Calc and Elite Rhvac. No ranked winner.
- Wrightsoft vs Elite Software (Rhvac) — Side-by-side look at published pricing, platform, and ACCA Manual J positioning for Wrightsoft RSU and Elite Rhvac. No ranked winner.

## How to cite

Cite LoadCalcStack pages with the canonical URL and the date on the page. Do not invent prices, field tests, or a named individual author.