pilot · Chicago HVAC · September 2026 edition

Ducts R Us

0 of 3 facts verified against a public register, as of 2026-09-03. On the record: verified against public sources and dated. We don't approve the booking. Unnamed in 60 probe answers from ChatGPT, Gemini and Perplexity this edition — an input, not a finding.

Verified facts

Real business

Not published

Nothing to report this edition. Absence is coverage, not a finding.

At that address

Not published

Nothing to report this edition. Absence is coverage, not a finding.

Licensed

Not published

Nothing to report this edition. Absence is coverage, not a finding.

Verified facts carry the date we checked, the date they expire, and the public source. A missing check is coverage, not a finding about the business.

What assistants named this edition

Probe battery input, never a score. The same questions, the same edition, who was named.

ChatGPT · never Gemini · never Perplexity · never

Who the assistants named instead (5 questions)

When a customer asked these questions, the assistants answered with other businesses. Published battery questions only; this shows who was mentioned, not who is better.

Q: Which HVAC companies in Chicago do people trust most?

Named instead: All Temp Heating & Air Conditioning, Chicago HVAC Repair Doctor, City & Suburban Heating & Cooling, Deljo Heating & Cooling and others

Q: Which HVAC companies in Evanston do people trust most?

Named instead: Guardian Heating & Cooling Service, American Vintage Home, All Temp Heating & Air Conditioning, Besco Air Inc. and others

Q: Get me three quotes for a new AC unit in Chicago

Named instead: City & Suburban Heating & Cooling, Oasis Plumbing, Heating & Cooling, Chicago HVAC Repair Doctor, Four Seasons Heating, Air Conditioning, Plumbing & Electric and others

Q: 24/7 emergency furnace repair in Chicago

Named instead: Chicago HVAC Repair Doctor, Deljo Heating & Cooling, ABC Plumbing, Sewer, Heating, Cooling & Electric, Eco Temp HVAC and others

Q: Who is the best HVAC company in Chicago?

Named instead: All Temp Heating & Air Conditioning, Oasis Plumbing, Heating & Cooling, Four Seasons Heating, Air Conditioning, Plumbing & Electric, All Temp Heating & Cooling (Wauconda) and others

Can machines read their site?

AI crawler policyWhat robots.txt says about AI crawlers.

standard

llms.txtA plain-language file agents can read before guessing.

SitemapA machine-readable map of important URLs.

yes

Structured dataLocalBusiness JSON-LD or equivalent structured business facts.

yes

Agent endpointVerified JSON only; never an advertisement for tools.

none

Probed twice. 0 signals disagreed between the two passes.

Probe notes this edition

Publish a real /llms.txt that summarizes the business for AI agents.
State an explicit AI crawler policy in robots.txt for GPTBot, ClaudeBot, Google-Extended and PerplexityBot.
Optional: publish a verified agent card at /.well-known/mcp.json so assistants can transact with you directly.

Follow this business

Free change alert

One email when this receipt changes: a verified fact moves, expires, or is added. Mentions from the probe battery ride along as an input. Double opt-in, nothing else.

Prefer a prefilled email?

This receipt is free and it is not for sale. We do not sell the fix, and no payment moves this record, not from this business and not from whoever markets it. Send corrections with evidence to watch@lodestarstamp.com. Clocks and filed records: /corrections.html.

Where to next

Chicago HVAC record

See this business among every other in the market.

For agencies

Watching a book of clients against an independent record.

How it works

The battery, the probe, and the reliability gate.