Intry Verified receipt
Is the Intry Manual J Load Calculator accurate?
The provenance receipt for the Intry Manual J Load Calculator: the exact authority its values derive from, the edition they are keyed to, who has final say, and what our automated checks hold them against, rebuilt from their cited source.
The receipt
- Calculated from
- ACCA Manual J, 8th Edition, Abridged Edition (MJ8AE), Form J1 and Form J1ae · ASHRAE Handbook of Fundamentals 2021, Chapter 14, climatic design conditions · US Census Bureau 2020 Gazetteer Files, ZIP Code Tabulation Areas (ZCTA5). Reused verbatim from the locked engine, never re-written for this page.
- Edition
- ACCA Manual J 8th Edition (the load procedure) with the ASHRAE Handbook of Fundamentals 2021 Chapter 14 design conditions; not a code table
- Checked
- Before any release, an automated check runs the locked engine that produces these figures and holds its answers against values written from the source it cites, so a checked number answers to its source and not merely to itself. The check covers the cases someone wrote a check for, not every input the tool accepts: it tells you where a number comes from, and it is not a proof of every value. As of the current build that suite holds 30696 checks, and this page has to clear them too. This is our own deterministic gate, not a third-party audit.
- Runnable
- Exposed at the Intry MCP endpoint. An AI assistant can run this calculator, and before each release an automated check confirms the answer it returns is identical to the one the website's own engine produces.
- Final say
- A full permit-grade ACCA Manual J has final say. This is not ACCA-approved: its whole-house heating total rests on four site conditions you declare, and its cooling load rests on two more. It reports a whole-house COOLING load as the PAIR Manual J section 5-12 sizes equipment from: the total sensible load (Form J1ae line 20) and the total latent load (line 21). Either is withheld when a printed term of it is unanswered or has no printed route in the abridged edition, and the specific term is named on the result rather than folded in.
Frequently Asked Questions
Is the Intry Manual J Load Calculator accurate?
It computes from the sources described below, and our automated checks hold its answers against values written from those sources for the cases the checks cover, not for every input you can enter. A full permit-grade ACCA Manual J has final say. This is not ACCA-approved: its whole-house heating total rests on four site conditions you declare, and its cooling load rests on two more. It reports a whole-house COOLING load as the PAIR Manual J section 5-12 sizes equipment from: the total sensible load (Form J1ae line 20) and the total latent load (line 21). Either is withheld when a printed term of it is unanswered or has no printed route in the abridged edition, and the specific term is named on the result rather than folded in. Every figure an Intry calculator computes comes from a locked source module, not hand-typed. 30696 automated checks, one suite for the whole site rather than a per-tool count, re-derive the numbers before each deploy from the tables this site transcribed from the ACCA Manual J 8th Edition Form J1 worksheet procedure and the ASHRAE Chapter 14 design conditions it was computed from. This is our own deterministic gate, not a third-party audit. The per-tool receipt is public at https://www.intrysys.com/verified.