Company lists · Data refreshed September 2026
Top 25 Commercial geothermal installers worldwide
RevenueBase identified 5,291 commercial geothermal installers worldwide as of September 2026 and tracks 37,119 professional contacts across them, including 11,403 with verified work emails. The United States is the largest market and London the largest hub.
This list covers commercial geothermal installers worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026. Country and city lists for commercial geothermal installers follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest commercial geothermal installers worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,128 contacts → | ||||
Indirect evidence “At Danfoss Climate Solutions, we engineer energy-efficient heating and cooling solutions to help the world get more out of less.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 850 contacts → | ||||
Partial evidence “We're leading the energy transition to zero carbon, by offering complete residential and commercial heating and hot water solutions.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 781 contacts → | ||||
Indirect evidence “Sinds het ontstaan in 1947 is Feenstra marktleider in installatietechniek met een nationale dekking.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 348 contacts → | ||||
Indirect evidence “Whether building quality work environments, valuable relationships or community ties, Air Systems never cuts corners.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 323 contacts → | ||||
Partial evidence “Boland is the leading commercial HVAC systems, services, and building energy solutions provider in the DC metro area.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 265 contacts → | ||||
Indirect evidence “A Arclima Engenharia é uma empresa brasileira especializada em Climatização, Refrigeração e Eficiência Energética (HVAC), com atuação em todo o território nacional.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 224 contacts → | ||||
Indirect evidence “WaterFurnace International, Inc.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 220 contacts → | ||||
Partial evidence “Tolin Mechanical is a Leading Energy & Commercial HVAC Services Company.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 218 contacts → | ||||
Indirect evidence “As one of the largest full service mechanical contractors headquartered in the Pacific Northwest, Holaday Parks has grown well beyond Seattle.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 211 contacts → | ||||
Indirect evidence “De energietransitie is één van de grootste maatschappelijke opgaven, maar wij begrijpen dat jouw wooncomfort net zo belangrijk is.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 210 contacts → | ||||
Partial evidence “Dalkia Energy Solutions, a subsidiary of the EDF (Électricité de France) Group, is a national leader in energy efficiency and sustainability for commercial, industrial, and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 190 contacts → | ||||
Partial evidence “Haynes Mechanical Systems has been keeping commercial buildings running strong since 1968.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 183 contacts → | ||||
Indirect evidence “MAXAIR Mechanical, founded in 1988, is a people first company.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 178 contacts → | ||||
Indirect evidence “Backed by 80 years of experience, the more than 300 associates at EMCOR Services Aircond design and deliver comprehensive, timely, and cost effective HVAC and building system…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 168 contacts → | ||||
Indirect evidence “Hill York is a full service contractor that offers a full array of energy efficient air-conditioning services from concept to completion, maintenance to repair and everything in…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 166 contacts → | ||||
Indirect evidence “Headquartered in Harrisburg, Pennsylvania, McClure Company is one of the mid-Atlantic's largest, fully integrated mechanical construction, engineering, maintenance and energy…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 159 contacts → | ||||
Indirect evidence “Agtherm est une PME indépendante dont l'activité dans le domaine du génie climatique et de la performance énergétique, vous assure la sécurité et la qualité de ses interventions…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 159 contacts → | ||||
Indirect evidence “For nearly a century, GSM Services has built its reputation on reliability, honesty, expert service, and high-quality workmanship.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 149 contacts → | ||||
Indirect evidence “Accenta aide les acteurs de l’immobilier à maîtriser leurs charges, valoriser leurs actifs et répondre aux exigences réglementaires, grâce à la performance énergie-carbone.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 149 contacts → | ||||
Indirect evidence “Eteck levert duurzame energie in de vorm van koude en warmte.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 132 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 128 contacts → | ||||
Partial evidence “ABOUT http://iceland-drilling.com/ Iceland Drilling Ltd is a leading high technical company in the field of high temperature geothermal drilling and has many decades of experience…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 118 contacts → | ||||
Partial evidence “Dandelion Energy is the nation’s leading residential geothermal provider, on a mission to make the world’s most efficient heating and cooling technology accessible to everyone.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 116 contacts → | ||||
Partial evidence “We are a global provider of energy efficiency solutions for commercial buildings with five business offerings: HVAC Testing, Adjusting & Balancing, Intelli-Hood® Kitchen…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 113 contacts → | ||||
Indirect evidence “Our goal at Powers is to make your buildings productive, comfortable, and efficient to operate.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: commercial geothermal installers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names commercial geothermal installers.
- Partial evidence
- Its own public description names part of commercial geothermal installers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name commercial geothermal installers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 5,291 commercial geothermal installers worldwide
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Commercial geothermal installers worldwide at a glance
As of Sep 19, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among commercial geothermal installers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for commercial geothermal installers are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “commercial geothermal installers”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names commercial geothermal installers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among commercial geothermal installers, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 11,403 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Commercial geothermal installers by location
18 lists · largest firstEvery Commercial geothermal installers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Commercial geothermal installers based in the United States1,153
- Commercial geothermal installers based in France509
- Commercial geothermal installers based in the United Kingdom352
- Commercial geothermal installers based in the Netherlands330
- Commercial geothermal installers based in Germany319
- Commercial geothermal installers based in Italy301
- Commercial geothermal installers based in Spain280
- Commercial geothermal installers based in Canada196
- Commercial geothermal installers based in Belgium140
- Commercial geothermal installers based in Switzerland100
- Commercial geothermal installers based in Australia90
- Commercial geothermal installers based in India71
- Commercial geothermal installers based in Portugal48
- Commercial geothermal installers based in Sweden48
- Commercial geothermal installers based in Finland44
- Commercial geothermal installers based in Austria42
- Commercial geothermal installers based in Ireland34
- Commercial geothermal installers based in Denmark31
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names commercial geothermal installers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many commercial geothermal installers are there worldwide?
RevenueBase identified 5,291 commercial geothermal installers worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Danfoss Climate Solutions, headquartered in Nordborg, tops this list with the largest team on record.
Which country has the most commercial geothermal installers?
The United States leads with 1,153 companies, followed by France (509) and the United Kingdom (352). Every commercial geothermal installers list by country and city is linked on this page.
Which city has the most commercial geothermal installers?
London leads with 31 headquartered companies, followed by Madrid (27) and Houston (19).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 11,403 verified decision-maker contacts tracked across these 5,291 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.