Method
Evidence and method
The Business Ambiguity Lattice on this site is a practical way to unpack a commercial claim. It is this site’s operational method. A dedicated lattice paper was not the source, and the method is not presented as a verdict.
The Custodial Knowledge Model (Aziel Eliab, August 2026) is a conceptual working paper cited in the build notes for stewardship and correction. It is not an independent validation of any HVAC price.
Claim
What is promised? Example: “Get a furnace free.”
Reference
Compared with what? MSRP, list price, allowance, or a prior selling price.
Conditions
What qualifies it? A basic model, excluded labor, required add-ons.
Total
Equipment + labor + modifications + fees − credits the contract applies.
Verification
Itemized quote, model numbers, terms, invoices, a comparable offer.
Map a claim
Illustrative case template
Illustrative example Last reviewed 2026-10-31. This is not a report about a real company, city, or invoice.
| Title | Fictional package offer |
|---|---|
| Date of quote | None. This row is a template. |
| Region | Unknown |
| Source | Invented for the calculator example |
| Redaction | Not applicable. No document exists. |
| Advertised claim | “Buy a new AC and get a furnace free.” |
| Model | Unknown. The template refuses to invent a model number. |
| Allowance | $1,500 fictional |
| Equipment price | $1,500 fictional |
| Labor | $4,800 fictional |
| Other required work | $900 fictional materials. Permits and disposal entered as an explicit $0 in the calculator example. |
| Incremental installed furnace cost | $5,700 in the fiction. The allowance covers the fictional equipment line and not the labor. |
| Comparable alternative | Unknown |
| Documented | Only the arithmetic of the made-up inputs. |
| Unknown | Model, house, contractor, whether any real buyer saw these prices. |
| What would verify a real case | A redacted itemized quote, model numbers, a comparable price without the promotion, and the written terms. |
| Consumer impact | A shopper who stops at the word “free” may not ask what labor and modifications still cost. |
| Corrections | None. Template first published 2026-10-31. |
Evidence labels used on this site
- Verified document
- User-submitted, not independently verified
- Illustrative example
- Industry source
- Analysis or inference
Broad market claims would need a dataset size, region, date range, inclusion rules, and limitations. None is published here. Corrections are listed on the corrections page.
Usefulness on this server
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