Intry Verified receipt

Is the Intry BTU / HVAC Load Calculator accurate?

The provenance receipt for the Intry BTU / HVAC 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 (simplified): the load model · ACCA Manual S, Table N2-1: the equipment-fit window · IECC 2021 climate zones (the zone boundaries only) · ACCA Manual S (equipment fit) · NREL/TP-5500-60801 (November 2014): the oversizing energy penalty, and its scope · ENERGY STAR Room Air Conditioner sizing table. Reused verbatim from the locked engine, never re-written for this page. The documents it rests on are listed in the source receipt on the tool page.

Edition

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 30959 checks, and this page has to clear them too. This is our own deterministic gate, not a third-party audit.

Runnable

A reference engine behind the published numbers on this site. Runnable access is offered on the calculators exposed at the Intry MCP endpoint.

Final say

A full Manual J on the actual house has final say.

Frequently Asked Questions

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