There are 230,000 HVAC and plumbing contractors in the United States. According to the 5WPR 2026 HVAC and Plumbing AI Visibility Index, only about 50 of them have meaningful AI citation share. The other 229,950 are invisible to homeowners who open ChatGPT before they open Yelp.
That number comes from a study 5W Public Relations published in April 2026. They ran 65-plus consumer-intent and trade-intent prompts through ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews, then tracked which brands those AI engines actually named in their answers. The results were lopsided enough that Plumbing and Mechanical, a trade publication, ran the same headline: 87% of independent HVAC and plumbing contractors have effectively zero AI citation share in their own metro and category.
This includes shops with 800 five-star Google reviews and decades of customer relationships. The highest-reviewed independent plumber in a metro can be absent from AI answers while a national franchise with a generic landing page gets recommended every time.
What the study measured
The 5WPR index is not a traditional Google SEO audit. It measured something different: whether AI assistants mention a business when they answer a buying question. When a homeowner asks ChatGPT "best plumber near me" or "my AC stopped working, who do I call," which businesses come up in the answer?
Three national brands, Roto-Rooter, ARS/Rescue Rooter, and Mr. Rooter, pulled an estimated 19% of all consumer-intent AI citations between them. The rest of the visible field was a short list of national service networks (Service Experts, One Hour Heating and Air, Benjamin Franklin Plumbing) and a handful of contractor software brands whose content saturates the trade press.
5WPR describes these numbers as directional estimates based on prompt sampling, not a census of every AI answer. Results shift by region, wording, and platform. But the direction is consistent across every metro they tested, and a reputable trade outlet confirmed the same finding independently.
Why national franchises win and independents lose
AI engines do not rank businesses the way Google does. Google's Map Pack weighs proximity, review volume, and keyword relevance. AI engines weigh something different: whether they can confirm a business is real, consistent, and trustworthy across multiple independent sources.
National franchises win because they have what AI engines look for:
Consistent NAP across every directory. Roto-Rooter has the same business name, address, and phone number on Google, Bing, Yelp, Angi, the Better Business Bureau, and 50 other directories. An independent plumber might have a Google Business Profile and a Yelp page with slightly different names, no Bing Places listing, and no presence on industry directories. AI engines treat inconsistent information as a confidence problem. If they cannot confirm a business across sources, they skip it.
Wikipedia presence and structured corporate data. National franchises have Wikipedia pages, corporate press coverage, and structured data that AI engines can parse. Most independent contractors do not have a Wikipedia page, and their websites lack the LocalBusiness schema that gives AI a clean data source.
Brand age and content history. National franchises have been producing web content for decades. AI engines lean on entities with long content histories because that history is a trust signal. A contractor who launched a website two years ago is starting from zero in the AI entity graph, regardless of how good their work is.
Volume of third-party mentions. National franchises are mentioned in news articles, trade publications, and consumer review sites at a volume that independents cannot match. AI engines weight third-party mentions heavily because they are harder to fake than self-published content.
What the 13% are doing differently
The contractors who do appear in AI answers are not necessarily the biggest or the highest-rated. They are the ones who have made themselves confirmable across the sources AI engines check.
They claim every directory listing, not just Google. A Bing Places listing is the single highest-impact action for ChatGPT visibility because ChatGPT pulls local data from Bing's index. Claiming Bing Places takes 15 minutes and costs nothing, but most independent contractors never do it.
They maintain a 4.3+ star rating. Research from f9 Analytics found that ChatGPT applies a star-rating floor of 4.30 for business recommendations. Perplexity's floor is 4.10, and Gemini's is 3.90. Google Maps still surfaces businesses at 3.50 to 4.00, which means the bar for AI recommendation is higher than the bar for Map Pack visibility. Star ratings are the new AI visibility gatekeeper, and a contractor with a 4.1 average may be invisible to AI even with a strong Google ranking.
They publish answer-shaped content. Pages that directly answer the questions homeowners ask are more citable than generic service pages. "How much does a water heater replacement cost in Bergen County, NJ" is a page AI engines can cite. "Quality residential solutions for Northern New Jersey" is not. Answer-shaped content matches the format of the question being asked, which is what answer engine optimization is built around.
They earn third-party mentions. Local news coverage, supplier websites, trade association directories, and legitimate trade press are the citation sources AI engines trust. A contractor mentioned in a local newspaper article about a community project gets a signal that a contractor with 800 Google reviews but zero press coverage does not.
They keep content fresh. AI engines treat recent content as a signal that a business is active. A Google Business Profile with posts from this month, a website with a blog updated weekly, and new photos on directory listings all feed the content freshness signal. A listing claimed once and never updated looks abandoned to AI.
The gap between Google reputation and AI visibility
The most counterintuitive finding in the 5WPR study is that Google reputation does not translate to AI visibility. An independent plumber with the highest Google review count in a metro, the longest tenure, and the best customer outcomes can be systematically absent from AI answers. Meanwhile, a national franchise with a lower local rating gets recommended because its data is consistent, confirmable, and cited across the sources AI engines check.
This is the gap FirstCall Visibility was built to close. Google reputation is table stakes. AI visibility requires a different set of signals: directory consistency across platforms, structured data on the website, third-party mentions, content freshness, and a star rating above the AI floor. Most contractors have some of these but not all of them, and AI engines require all of them to recommend a business with confidence.
How to move from the 87% to the 13%
The path from invisible to cited is not mysterious, but it does require doing several things that most independent contractors have not done:
- Claim the Bing Places listing. 15 minutes, zero cost, highest single-action impact for ChatGPT.
- Add LocalBusiness schema to the website. Gives AI engines a clean, structured data source.
- Get the star rating above 4.30. Solicit recent reviews from happy customers. Volume and recency both matter.
- Claim industry directory listings. PHCC for plumbing, ACCA for HVAC, IBEW or IEC for electrical.
- Publish answer-shaped content. Pages that answer specific homeowner questions in specific locations.
- Earn third-party mentions. Local news, trade publications, supplier websites.
- Keep everything fresh. Update listings seasonally, post on Google Business Profile weekly, add new photos quarterly.
None of these require a large budget. What they require is consistency across the sources AI engines check, and most contractors stop at Google and call it done.
FAQ
What does "AI citation share" mean?
AI citation share is the percentage of times a business gets named in AI answers when a user asks a relevant question. If ChatGPT recommends a plumber 10 times out of 100 relevant prompts in a given metro, that plumber has a 10% AI citation share for that metro. The 5WPR study found that 87% of independent contractors have effectively zero, meaning they never appear in AI answers for their own service area.
Why does ChatGPT recommend national franchises over local businesses?
ChatGPT recommends businesses it can confirm across multiple independent sources. National franchises have consistent business information across every major directory, Wikipedia pages, corporate press coverage, and decades of web content. AI engines treat this consistency and volume of third-party mentions as trust signals. Most independent contractors have inconsistent information across directories and few third-party mentions, which makes them hard for AI to confirm and recommend.
Does having high Google reviews help with AI visibility?
Google reviews help, but they are not sufficient on their own. The 5WPR study found that independent plumbers with 800+ five-star Google reviews were systematically absent from AI answers. AI engines weight review volume and recency, but they also require directory consistency, structured data, third-party mentions, and content freshness. Google reviews are one signal among several, not the whole picture.
How can a small contractor compete with national franchises in AI search?
A small contractor competes by becoming the most confirmable business in their specific metro. National franchises cannot match a local contractor on location-specific signals: service area pages for specific counties, local press coverage, community involvement, and directory listings in local trade associations. The goal is to be the business AI engines can verify with the highest confidence for a specific location.
What is the fastest way to improve AI visibility for a trades business?
Claim a Bing Places listing (15 minutes, free), add LocalBusiness schema to the website (30 minutes), and get the star rating above 4.30 (ongoing review solicitation). These three actions address the most common reasons independent contractors are invisible to AI: missing directory presence, missing structured data, and star ratings below the AI floor.
Run your free AI visibility audit to see whether your trades business is in the 87% or the 13%. The audit checks 12 signals across ChatGPT, Gemini, and Perplexity and flags exactly what to fix to move from invisible to cited.