Finding Aged Plumbing and HVAC Domains for a PBN in November 2026: 509 Trade Lots, 9 Strong Ones, 1 Conditional Pick

I'm building a small private blog network for a US plumbing and HVAC lead-gen site, so I checked what this week's domain auctions offer the trade. Below are the filters, the counts at every step, the domains that made it and the ones I threw out.

Data as of November 12, 2026, 02:50 UTC. Auctions change by the hour. By the time you read this, several of these lots will have closed or moved to another platform.

9 of the 509 plumbing and HVAC domains on auction this week passed every clean-history and strength filter I set in Karma.Domains, a domain search tool that tracks 13M+ domains from 40 auction sources. After I opened the full reports, none of them was clean enough to buy blind. Three are worth a look, one is a conditional pick, and the most dangerous one had a Moz Spam Score of only 3.

The task

In the buyer's words: "I need aged domains for PBN sites that support a US plumbing and HVAC lead-gen project. The old links should come from the trade: plumbers, HVAC firms, home-service directories. No casino networks, no citation spam, and nobody's live business name."

I wrote the success criteria down before searching: a US plumbing, HVAC, duct or sewer history; an auction still open after today; no live business name; and links I can actually read. Everything else went into the Karma.Domains search, one layer at a time:

• Market: domains on auction, ending November 12 to 19
• Niche: past category Home Services, plus archived pages mentioning plumbing, plumber, HVAC, heating or air conditioning, in English
• Clean history: no redirects, no 403s, no Asian-script pages, 3+ years in the archive, toxic categories and parked or empty sites excluded
• Strength: Moz Spam Score up to 10, KarmaScore 60+, then authority of 15+ and 30+ referring domains by any one vendor

The funnel

10,000+ → 6,393 → 509 → 245 → 64 → 9 → 15 read → 6 reports → 3 finalists

The count caps at 10,000+, so the first number is a floor. Home Services is a broad tag that also covers cleaners, movers and painters, which is why the keyword layer cuts it from 6,393 to 509. The clean-history layer removes more than half of what's left, and the strength floor takes 245 down to 9.

I read all 9 rows, plus the top 10 of the 64 sorted by Karma Metric, for 15 unique domains. Nine of those I dropped on the row data alone:

• Wrong country: a Plymouth boiler firm (gasandplumbingplymouth.co.uk), a Brisbane air-con company (speedyaircon.com) and a Dubai maintenance firm (midwaystars.com).
• Vendor gaps: quickhandsgg.com shows Moz DA 61 in every monthly reading, but Majestic sees 7 referring domains with Trust Flow 0 and Ahrefs DR is 0. a1miamiacrepair.com has 1,609 referring domains in Semrush against 12 in Moz, and findwaterdamagerestoration.com has 1,486 against 75, with Trust Flow 0.
• Closing today: fuseorlando.com (DropCatch, $59, 0 bids) and brooklynsewersolutions.com (GoDaddy closeout, $30) both end on November 12.
• Too thin: sotexpropane.com has 8 Moz referring domains and DA 1.

That left 6 domains for full reports.

The finalists

mesaairductcleaning.com: the conditional pick

This is the most consistent history in the set. From 2013 to 2026 the site was about one thing: air duct, dryer vent and chimney cleaning in Mesa, Arizona. No topic switch, no parking, no risk tags. Its Karma Metric of 19 is the highest among the lots I read that stay open past today, with content continuity at 63 and stability at 90.

The weak spots: 39.2% of snapshots returned HTTP 407 errors, and Google now shows the registrar's "This domain has expired" page. In October GoDaddy listed it at $1, then ran it through closeout at $40, $30, $11 and $5. Nobody bid.

I couldn't read its links. The stored report had no Moz backlink sample, and a live backlink check returned nothing. So this pick comes with a condition: pull a backlink export from another source before you bid. If the links are local directories and HVAC sites, it's a solid PBN node about indoor air quality in Arizona. If they turn out to be spam, skip it. The name is a generic descriptive phrase, so no live brand comes attached.

arborbreezehvac.com: the most real, and the riskiest name

This was a working HVAC company in Ann Arbor, Michigan, and it still holds positions between 12 and 19 for phrases like "ann arbor heating and cooling" and "hvac company ann arbor". The Moz sample is tiny (4 links), but three of them are the right kind: a Michigan garage-door company's Ann Arbor page, an HVAC directory and a business-profile site. Anchors are 50% the bare URL, 25% "Website" and 25% the www URL, which is exactly what local citations look like. One link comes from a junk listing page on a watch site.

Two problems. Moz has already lost 20 of its 32 referring domains, and the business is still listed on Yelp, Facebook and ZoomInfo, so I can't confirm the company is closed. I wouldn't run a PBN site under that name in that city. It works better as a 301 into your own Michigan HVAC site, once you've confirmed the company is gone. Like the Mesa lot, it sat through GoDaddy closeout at $30, $11 and $5 with 0 bids.

divineflangefittings.com: the cheapest, with a crypto anchor

Trust Flow of 21 against Citation Flow of 10 is a good sign, and this lot stays open the longest. Live Moz data also shows 95 referring domains, far more than the 25 in the stored report. The history is the catch. From 2018 to 2022 it was a flange-fittings site with headings about real estate, airbags and insurance, which reads like a general guest-post blog. In 2022 and 2023 it showed a "Hello world!" post. The plumbing-repair content only arrived in 2023.

The live sample had 6 links: one real industrial supplier directory, two domain-list pages, one SEO spam page and one German café page with the anchor "binance". When a crypto anchor shows up in 6 links, I assume there are more. Fine as a cheap tier-2 site, weak as a main PBN node.

Rejected

thumbsuprooter.net: the trap. An Oakland plumbing and sewer company from 2021 to 2025, real trade links from expertise.com, excellentcontractor.com, exceptionalplumber.com and hireplumbersnearme.com, and a Moz Spam Score of just 3. Then I opened the backlinks. 14 of the 23 links in the Moz sample point to subdomains like linetogel.thumbsuprooter.net and kenzobet.thumbsuprooter.net, with Indonesian gambling anchors such as "linetogel", "pingtoto" and "rajatogel promosi". Someone is pointing casino spam at this domain's subdomains. Semrush counts 47,927 backlinks from 326 domains, and a Spam Score of 3 gives no hint of it.

stlouismandarinhouse.com: a restaurant wearing an HVAC blog. It has the best raw numbers in the shortlist (DA 18, 160 Majestic referring domains). The archive tells the story: a Chinese restaurant in St. Louis from 2013 to 2018, a maintenance page, then an "AC repair" WordPress blog from 2020. The old restaurant links from feastmagazine.com and gbguides.com are real, but they're restaurant links. The recent ones are worse: 82.61% of anchors in the sample are the single phrase "stlouismandarinhouse", from 19 directory sites that all use the same "/website-list-1392" page.

ecohomefeatures.com: authority that appeared overnight. DA 42 with 208 Moz referring domains, but its DA history sits at 1 for about two years and then jumps to 25 and 42. It's a general lifestyle blog (cookware, herbs, flooring), listed next to sister sites like trendingkitchendesigns.com, and one page mentioning it carries a comment signed "온라인바카라사이트" (Korean for "online baccarat site"). It isn't a trade domain, and its auction ends today anyway.

Final pick and what to do next

My pick is mesaairductcleaning.com, on one condition. It has the longest on-topic history among the finalists, no brand to inherit and the best content continuity of the three. Arbor Breeze has better proof of real links but carries a business name that may still be in use. Divine Flange Fittings is cheaper and stays open longer, but its plumbing topic is a 2023 rebuild with a crypto anchor already showing.

If you buy it:

1. Get a full backlink export first. Bid only if most links are local directories and HVAC sites.
2. Disavow anything with casino, crypto or "website-list" patterns before you add a single post.
3. Rebuild the same topic: air duct cleaning, indoor air quality and HVAC maintenance for Arizona homes. A topic switch throws away the one strength this domain has.

Checklist for any auction domain

• Count referring domains in at least two vendors. A Semrush number ten times Moz's is noise until proven otherwise.
• Open the backlink sample and look at the target URLs too. Subdomain links with casino anchors won't move the Spam Score.
• Read the archive year by year. A restaurant, a "Hello world" post or a parked page before the current topic means a rebuild.
• Check one anchor's share. When one phrase holds 80% from look-alike directory pages, that's a network.
• Look at the DA history. A flat 1 that jumps to 40 within months deserves suspicion.
• Check the auction history. Repeated closeouts at $40, $30, $11 and $5 with 0 bids tell you what other buyers concluded.
• Search the business name. If Yelp or Facebook still lists the company, treat the domain as someone's brand.
• Drop lots that close before you can act. Five of the 15 I read ended the same day.