# 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 / new owners) shopping Manual J / load-calc tools. Independent reviews. We do not run an HVAC company. Not consumer AC repair. Not a generic HVAC FSM directory.

Author: LoadCalcStack editorial team

Content-Signal (robots.txt): search=yes, ai-input=yes, ai-train=no.
Agents may cite and summarize reviews. Do not treat this corpus as granted for model training.

## Start here

- [Home](https://www.loadcalcstack.com/): 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.
- [Directory](https://www.loadcalcstack.com/directory): vendor index with billing model and published prices
- [ACCA approved software](https://www.acca.org/standards/approved-software): authority list (not hosted by LoadCalcStack)
- [Guides](https://www.loadcalcstack.com/guides): standards and buyers notes, no ranked winner
- [Methodology](https://www.loadcalcstack.com/methodology): how claims are labeled
- [Affiliate disclosure](https://www.loadcalcstack.com/affiliate-disclosure): no commissions or ads as of September 2026; vendor links are informational
- [About](https://www.loadcalcstack.com/about)
- [Contribute](https://www.loadcalcstack.com/contribute): email contractor notes to loadcalcstack@agentmail.to
- [Privacy](https://www.loadcalcstack.com/privacy)

## Guides

- [What is Manual J and ACCA-approved load-calc software?](https://www.loadcalcstack.com/guides/what-is-manual-j-acca-approved-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](https://www.loadcalcstack.com/compare/cool-calc-vs-wrightsoft)
- [Cool Calc vs Elite Software (Rhvac)](https://www.loadcalcstack.com/compare/cool-calc-vs-elite-software)
- [Wrightsoft vs Elite Software (Rhvac)](https://www.loadcalcstack.com/compare/wrightsoft-vs-elite-software)

## Vendor profiles

- [Conduit Tech](https://www.loadcalcstack.com/vendors/conduit-tech): Not published. Pricing page directs you to request a quote. No public dollar amount on vendor pages retrieved 2026-09-15.
- [Cool Calc](https://www.loadcalcstack.com/vendors/cool-calc): Unlimited Pro $50/user/mo. Also lists $250/user/mo suite plan and $45/project. Retrieved 2026-09-15.
- [Elite Software (Rhvac)](https://www.loadcalcstack.com/vendors/elite-software): 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.
- [Wrightsoft](https://www.loadcalcstack.com/vendors/wrightsoft): RSU Residential Package $900/year (USA). Canada $925/year; Combined USA & Canada $1,125/year. Retrieved 2026-09-15.

## Machine-readable

- Markdown: fetch the `.md` URL for the same path (`/index.md`, `/directory.md`, `/vendors/{slug}.md`)
- [llms-full.txt](https://www.loadcalcstack.com/llms-full.txt)
- [Sitemap](https://www.loadcalcstack.com/sitemap-index.xml)
- [RSS](https://www.loadcalcstack.com/rss.xml)

## How to cite

Use the canonical page URL and the date on the page. Keep Verified fact / Editorial judgment / Unverified labels. Do not invent a winner, star ratings, affiliate relationships, or unpublished Conduit Tech list prices.