HVAC and plumbing in St. Louis, MO: who shows up online
All 20 St. Louis HVAC and plumbing businesses we checked have a website, and the 19 sites we audited all use HTTPS and work on mobile. The gaps are in the details. Only 74 percent have LocalBusiness schema, and 42 percent have an llms.txt file.
The top 20 hvac and plumbing on Google, measured
- 100%have a website
- 74%of sites use LocalBusiness markup
- 42%of sites publish llms.txt
- 95%of sites run Google Analytics or Tag Manager
- 4.9★average Google rating
- 1587median Google reviews
20 businesses from the Google results for “HVAC and plumbing company in St. Louis, MO”. 20 list a website; we checked the homepage of the 19 that loaded.
Who ChatGPT recommends
“Who is the best HVAC or plumbing company in St. Louis, MO?”
- Hoffmann Brothers
- Classic Aire Care
- Maplewood Plumbing & Sewer
- Seliga Heating & Cooling
- Tony LaMartina Plumbing Co.
6 of the 20 businesses in the Google results were named.
The review leaders
| Business | Rating | Reviews | Named by ChatGPT |
|---|---|---|---|
| Hoffmann Brothers | 4.9 | 12116 | Yes |
| Academy Air Heating, Cooling, Plumbing and Electric | 4.8 | 7563 | No |
| Classic Aire Care | 4.9 | 5621 | Yes |
| Hoffmann Brothers | 4.9 | 5275 | Yes |
| Anton's Plumbing, Heating/Cooling & Energy Experts | 4.9 | 4783 | No |
What this means for your shop
Every audited site has HTTPS, mobile support and tap-to-call links at 100 percent, so those basics will not set you apart from local competitors.
LocalBusiness schema sits at 74 percent and llms.txt at 42 percent, so adding both is a clear step you can take this month.
The average rating is 4.9 and the median business has 1587 reviews, so review volume is what separates you from the pack.
HVAC and plumbing in St. Louis: questions
How do I get recommended by ChatGPT in St. Louis?
We asked ChatGPT who the best HVAC or plumbing company in St. Louis is. It named Hoffmann Brothers, Classic Aire Care, Maplewood Plumbing & Sewer, Seliga Heating & Cooling and Tony LaMartina Plumbing Co. All came from our sample of 20, and 0 percent of sites block AI.
How many reviews do the local leaders have?
Hoffmann Brothers leads with 12116 reviews at 4.9. Academy Air Heating, Cooling, Plumbing and Electric has 7563 at 4.8, and Classic Aire Care has 5621 at 4.9. The median is 1587.
What are most local sites missing?
Structured data and AI-facing files. Only 74 percent have LocalBusiness schema, and only 42 percent have an llms.txt file. Analytics is on 95 percent of sites.
Where does your business stand?
This page shows the market. The free diagnostic shows you: 42 points on your site, your Google profile and what ChatGPT and Claude say about you, with the competitors beating you by name. Usually in under an hour.
Method: HopperCat pulled the top Google results for “HVAC and plumbing company in St. Louis, MO” on November 7, 2026, checked each business homepage for HTTPS, mobile setup, LocalBusiness markup, llms.txt, AI-crawler rules and analytics, and asked ChatGPT the question above with web search on. Ratings and review counts are Google's at that date.