Methodology

This is a reference database, not a blog. Every value on the site — every AHRI number, every part number, every spec — is either traceable to a source we actually retrieved, or it isn't published at all. This page explains exactly what that means; the per-row source links and confidence badges throughout the site are where that promise gets kept, not just stated.

The rule

We never generate, infer, interpolate, or guess a spec value. Not one. If an AHRI match, a part number, or a code requirement isn't traceable to a real source we retrieved, it does not go on the site — including values that would be easy to assume from general knowledge (a brand's typical refrigerant, a plausible-looking model number, a "usually true" spec). Several examples of this rule in practice, not as a hypothetical:

• Refrigerant type is left blank rather than inferred from the brand, unless a specific source states it for that specific model.
• When a source document contained an ambiguous or incomplete row — a missing reference number, a duplicate that shouldn't exist, a likely typo — the ambiguous data was either excluded or flagged with an explanatory note, never silently corrected or guessed at.
• The parts catalog lists official manufacturer part numbers only. There's no public data on which parts fail most often by model, so the site doesn't claim to know that.

Every record carries four fields

Source URL

Exactly where the value came from. Required — the build fails if it's missing.

Source type

Whether it's a manufacturer's own document, a distributor's compiled chart, a government rule, or another category. This distinction matters: a distributor's compiled chart isn't the same evidentiary weight as the manufacturer's own document, even when both look like "a PDF with a table in it."

Retrieved date

When we actually pulled the value, so you can judge how current it is.

Confidence

Verified means the source is a primary document (the manufacturer's own publication, or independently cross-checked) and we're confident in the transcription. Unconfirmed doesn't mean a value is wrong — it means we haven't independently cross-checked it against a second, ideally primary, source yet. We'd rather flag something as unconfirmed than present a guess as settled fact.

What "AHRI match" means

AHRI (the Air-Conditioning, Heating, and Refrigeration Institute) independently tests and certifies that a specific outdoor unit, indoor coil, and furnace combination performs together the way the manufacturer claims. An AHRI reference number is proof that combination was actually tested, not just asserted by a spec sheet. It does not mean the price you were quoted for it is fair, or that the refrigerant or extras on your quote are necessary — that's a separate question, and it's what quote review is for.

Why we don't scrape the AHRI Directory

The AHRI Directory of Certified Product Performance's own terms of use prohibit downloading, entering its data into a database, or republishing it outside individual, non-commercial, personal reference. So this site doesn't. Equipment-matching data instead comes from manufacturers' own published match-up documents (or, where flagged, a distributor's compiled chart), with the AHRI reference number cited as a pointer and a link to AHRI's own public search so you can verify it yourself — which is exactly the kind of individual, non-commercial use their terms permit.

Current data

As of this page's last update: equipment-matching data covers Goodman, Daikin, and Lennox (Lennox from their own official AHRI system-match bulletin; Goodman/Daikin from a distributor-compiled chart, flagged unconfirmed accordingly). The parts catalog covers one Goodman model family (GSXN4) from their official repair-parts manual. Coverage is expanding incrementally — each new brand or content area gets the same sourcing discipline described above, not a shortcut.