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pilot · Chicago HVAC · September 2026 edition

Guardian Heating & Cooling Service

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. Named in 7 of 60 probe answers this edition (ChatGPT and Gemini) — an input, not a score.

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.

Use your stamp

This seal is live. Wherever it is placed, it reads the record each time it is shown, says exactly what this receipt says, and links back to this page. When the record changes, the seal changes with it. Nobody can buy it and it costs nothing: it is the same instrument for every business on the record.

Today it reads NOT YET CHECKED · ON THE RECORD · 0 OF 3 FACTS VERIFIED. When the register check verifies this business, the same address starts reading VERIFIED, with no change to the embed.

<a href="https://lodestarstamp.com/companies/guardianheatingandcooling-com.html"><img src="https://lodestarstamp.com/v1/seal?domain=guardianheatingandcooling.com" width="160" height="160" alt="Lodestar Stamp: On the record, not yet checked against a public register."></a>

Open the image

For a dark background add &ink=dark; for a larger file add &size=480. The alt text is generated from the receipt, so a screen reader hears the same fact. Machine-readable receipt data: /index.json and this page.

What assistants named this edition

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

ChatGPT Gemini Perplexity · never

Named by a subset of assistants. Only ChatGPT and Gemini name them this edition; Perplexity never does. If either changes its mind, the other still names them — or does not. That is an input on the receipt, not a score.

Every answer that named Guardian Heating & Cooling Service this edition (3)

Verbatim lines from the checked-in capture files. Published battery questions only.

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

Guardian Heating & Cooling — not based in Evanston, but serves the area and has an impressive 4.9/5 from 393 reviews. It's a more established operation with 24/7 emergency service.

ChatGPT · Aug 11, 2026 · run chatgpt-r1

Q: Same-day AC repair near Evanston with upfront pricing

Guardian Heating & Cooling — Northbrook, 24/7, 4.9★/393 reviews; offers central-AC repair and says there's no service fee with paid repair during normal hours. (847) 582-0925

ChatGPT · Aug 11, 2026 · run chatgpt-r1

Q: Schedule an HVAC maintenance visit in Lincoln Park for under $150

| Guardian Heating & Cooling Service | AC/Heating Tune-Up and Cleaning promotion | $149 | Call (312) 818-2840 |

Gemini · Aug 12, 2026 · run gemini-r1

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.

yes

SitemapA machine-readable map of important URLs.

yes

Structured dataLocalBusiness JSON-LD or equivalent structured business facts.

Agent endpointVerified JSON only; never an advertisement for tools.

none

Probed twice. 0 signals disagreed between the two passes.

Probe notes this edition

State an explicit AI crawler policy in robots.txt for GPTBot, ClaudeBot, Google-Extended and PerplexityBot.
Add schema.org LocalBusiness JSON-LD so machines can read hours, service area and contact details.
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?

Watching · one business · First month free, then $149/month

What a subscriber gets

For this business. The receipt stays free.

First month free

New Watching subscriptions include a 30-day free trial; the card on file is charged $149 on day 31 unless canceled.

Then $149/month · USD · automatically renews until canceled. 14-day refund on the first paid invoice. Cancel future renewals by email.

Watching starts when your card is on file and the free month begins. The first briefing may go out before any charge.
Monthly readout for your selected business covering the previous month
Change alert when a change is published on your Lodestar receipt
Weekly digest for your selected business covering the previous week
Payment never touches the record

Watch this record — first month free, then $149/month See every email a subscriber gets

Own this business? Select this business for Watching

Watching starts when your card is on file and the free month begins. The first briefing may go out before any charge. A subscriber gets the baseline briefing, the monthly readout, the change alert for published changes, and the weekly digest for the selected business. The public receipt and seal remain free.

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.