Company lists · Data refreshed October 2026

Top 25 Geothermal contractors based in the United States

Name: Geothermal contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 13, 2026 6,736 companies tracked

RevenueBase identified 6,736 company matches for geothermal contractors associated with the United States as of October 2026 and tracks 106,934 professional contacts across them, including 36,335 with verified work emails. Houston is the largest hub.

This list covers company matches for geothermal contractors associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 13, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Oct 13, 2026 How this list was built

6,736Companies

106,934Contacts tracked

36,335Verified emails

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The 25 largest geothermal contractors based in the United States

Ranked by team size

Top 25 of 6,736 company matches for geothermal contractors based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 13, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Acco Engineered Systems	Exact match	Pasadena, CA, United StatesHQ recorded Oct 13, 2026	5,001-10,000	2,573 contacts →
	Exact match “Since 1934, owners and builders have selected ACCO Engineered Systems to design, install, and maintain more than mechanical projects.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
2	Macdonald-Miller Facility Solutions	Exact match	Seatac, WA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,365 contacts →
	Exact match “MacDonald-Miller Facility Solutions is a full-service, design-build mechanical contractor in the Pacific Northwest.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
3	Comfort Systems USA	Exact match	Houston, TX, United StatesHQ recorded Oct 13, 2026	10001+	1,354 contacts →
	Exact match “Comfort Systems USA \| Quality People.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
4	Ormat Technologies, INC	Exact match	Reno, NV, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,298 contacts →
	Exact match “With over five decades of experience, Ormat Technologies, Inc.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
5	Mckenney's, INC	Exact match	Atlanta, GA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,088 contacts →
	Exact match “McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
6	Wanzek Construction, Inc., A Mastec Company	Exact match	Fargo, ND, United StatesHQ recorded Oct 13, 2026	1,001-5,000	946 contacts →
	Exact match “Wanzek Construction, Inc, a MasTec Renewables company, is a leading general construction contractor and clean energy services company headquartered in Fargo, North Dakota.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
7	WHC Energy Services	Exact match	Broussard, LA, United StatesHQ recorded Oct 13, 2026	n/a	772 contacts →
	Exact match “WHC - A Surerus Murphy Company, is a privately held general contractor who provides construction services for renewable services, pipeline and related facilities to the oil and…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
8	SEL Construction Corporation	Exact match	Loomis, CA, United StatesHQ recorded Oct 13, 2026	n/a	722 contacts →
	Exact match “Experienced commercial contractor specializing in renewable energy, electrical, and roofing projects for privately-owned buildings as well as state/local government buildings in…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
9	Baker Group	Exact match	Ankeny, IA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	710 contacts →
	Exact match “Established in 1963, Baker Group is Iowa’s premier full-service specialty contractor-serving commercial, industrial, institutional, and mission-critical markets across the country.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
10	Harder Mechanical Contractors, INC	Exact match	Portland, OR, United StatesHQ recorded Oct 13, 2026	1,001-5,000	660 contacts →
	Exact match “Harder Mechanical is a nationally recognized contractor known for its strong safety culture, ability to meet demanding schedules, commitment to quality, and consistent delivery of…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
11	Alterman, INC	Exact match	Live Oak, TX, United StatesHQ recorded Oct 13, 2026	501-1,000	615 contacts →
	Exact match “Since 1923, Alterman has provided electrical construction on many of San Antonio and Austin's most impressive landmarks and contemporary structures.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
12	Murphy Company	Exact match	St. Louis, MO, United StatesHQ recorded Oct 13, 2026	1,001-5,000	587 contacts →
	Exact match “Per Colorado State Law Our CO Plumbing Contractor License Our Master Plumbing License is MP.03001288.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
13	Scmi INC	Exact match	Houston, TX, United StatesHQ recorded Oct 13, 2026	n/a	545 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
14	Arb, INC	Exact match	Irvine, CA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	535 contacts →
	Exact match “ARB Inc.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
15	JH Kelly, LLC	Exact match	Longview, WA, United StatesHQ recorded Oct 13, 2026	501-1,000	528 contacts →
	Exact match “JH Kelly is a fourth generation, family-owned construction company that provides HVAC and plumbing services to commercial facility owners and acts as a self-performing industrial…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
16	Pieper Electric, INC	Exact match	New Berlin, WI, United StatesHQ recorded Oct 13, 2026	501-1,000	508 contacts →
	Exact match “At Pieper Electric, Inc,"Our People Are Our Power" isn't just a phrase; it's our way of life.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
17	Entact, LLC	Exact match	Westmont, IL, United StatesHQ recorded Oct 13, 2026	501-1,000	491 contacts →
	Exact match “ENTACT is the partner of choice in solving our customer's most complex environmental remediation and geotechnical infrastructure challenges.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
18	Horizon Services, LLC	Exact match	Wilmington, DE, United StatesHQ recorded Oct 13, 2026	501-1,000	458 contacts →
	Exact match “Horizon Services is the premier heating, air conditioning, plumbing, drain cleaning and sewer services company in Delaware (New Castle County & Kent County), Pennsylvania…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
19	Jmeg Electrical Contractors	Exact match	Farmers Branch, TX, United StatesHQ recorded Oct 13, 2026	501-1,000	445 contacts →
	Exact match “JMEG is a team of professionals who have been providing electrical construction services for over 35 years throughout the state of Texas.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
20	Romanoff Group	Exact match	Gahanna, OH, United StatesHQ recorded Oct 13, 2026	1,001-5,000	422 contacts →
	Exact match “The Romanoff Group of Companies has been dedicated to providing specialized electrical, plumbing, and heating and cooling services since 1992.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
21	Kinetics	Exact match	Livermore, CA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	417 contacts →
	Exact match “Founded in 1973, Kinetics is a full-service process and mechanical contractor specializing in the design and installation of process, mechanical, plumbing and HVAC systems.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
22	Strada Services	Exact match	Sanford, FL, United StatesHQ recorded Oct 13, 2026	1,001-5,000	415 contacts →
	Exact match “Strada Services is a full service electrical, security, and air conditioning contracting company servicing residential, commercial, and industrial customers in Florida and in the…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
23	John W. Danforth Company	Exact match	Tonawanda, NY, United StatesHQ recorded Oct 13, 2026	501-1,000	410 contacts →
	Exact match “We are powered by the best people in the industry.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
24	Hooper	Exact match	De Forest, WI, United StatesHQ recorded Oct 13, 2026	501-1,000	396 contacts →
	Exact match “Hooper Corporation is your full-service electric power and mechanical contractor.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
25	DP Electric INC	Exact match	Tempe, AZ, United StatesHQ recorded Oct 13, 2026	1,001-5,000	388 contacts →
	Exact match “DP Electric (DPE) has a long history as a dedicated trade partner.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “geothermal contractors”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 6,736 geothermal contractors based in the United States

See the full list, filter by size, metro and specialty, and access 36,335 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Geothermal contractors based in the United States at a glance

As of Oct 13, 2026

34.0%Verified-email coverage

15.9Average contacts per company

11-50Median size (employees)

1.3%Largest-city concentration · Houston

Oct 13, 2026Page data refreshed

Companies by employee count

1-10

2,717

11-50

2,556

51-200

1,096

201-500

196

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 6,736 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United States whose business descriptions match “geothermal contractors” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 36,335 professional contacts with verified work emails across the full matched dataset. 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 October 13, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Geothermal contractors by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “geothermal contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many geothermal contractors are there based in the United States?

RevenueBase identified 6,736 company matches for geothermal contractors associated with the United States as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Acco Engineered Systems tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most geothermal contractors?

Houston leads with 87 company records, followed by New York (63) and Phoenix (41).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 36,335 professional contacts with verified work emails tracked across these 6,736 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 13, 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 SmartSearch, 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.