Company lists · Data refreshed September 2026

Top 25 Geothermal equipment manufacturers based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 234 companies tracked

RevenueBase identified 234 geothermal equipment manufacturers headquartered in the United States as of September 2026 and tracks 4,179 professional contacts across them, including 1,580 with verified work emails. Houston is the largest hub.

This list covers geothermal equipment manufacturers headquartered in the United States, 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 16, 2026.

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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 16, 2026 86% judged on-target in blind review

234Companies

4,179Contacts tracked

1,580Verified emails

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The 25 largest geothermal equipment manufacturers based in the United States

Ranked by team size

Top 25 of 234 geothermal equipment manufacturers based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal equipment manufacturers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Ormat Technologies, INC	Indirect evidence	Reno, NV, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,281 contacts →
	Indirect evidence “With over five decades of experience, Ormat Technologies, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
2	Waterfurnace International	Indirect evidence	Fort Wayne, IN, United StatesHQ checked Sep 16, 2026	201-500	224 contacts →
	Indirect evidence “WaterFurnace International, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
3	Climatemaster, INC	Partial evidence	Oklahoma City, OK, United StatesHQ checked Sep 16, 2026	501-1,000	178 contacts →
	Partial evidence “ClimateMaster’s role as a domestic energy and geothermal heating and cooling leader extends back to the late 1950s when the company was first founded in Florida.” Source: RevenueBase Database · checked Sep 16, 2026
4	Dandelion Energy	Partial evidence	Mount Kisco, NY, United StatesHQ checked Sep 16, 2026	51-200	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 16, 2026
5	Brightcore Energy	Indirect evidence	Armonk, NY, United StatesHQ checked Sep 16, 2026	51-200	108 contacts →
	Indirect evidence “Brightcore Energy is a leading renewable energy solutions provider serving commercial, institutional, and government clients.” Source: RevenueBase Database · checked Sep 16, 2026
6	Enertech Global, LLC	Strong evidence	Greenville, IL, United StatesHQ checked Sep 16, 2026	51-200	81 contacts →
	Strong evidence “Enertech Global is a leading manufacturer and visionary in the geothermal heating and cooling industry.” Source: RevenueBase Database · checked Sep 16, 2026
7	HTP Comfort Solutions	Partial evidence	New Bedford, MA, United StatesHQ checked Sep 16, 2026	51-200	76 contacts →
	Partial evidence “Established in 1974, HTP Comfort Solutions LLC is a full-fledged manufacturer on the cutting edge of energy efficient space and water heating technology.” Source: RevenueBase Database · checked Sep 16, 2026
8	Alpine Home AIR	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 16, 2026	51-200	68 contacts →
	Indirect evidence “Founded in 2002, Alpine is a team of forward-thinking innovators working to provide intelligent heating and cooling solutions to homeowners in a way that:* Leads Americans away…” Source: RevenueBase Database · checked Sep 16, 2026
9	Ephoca	Indirect evidence	Beachwood, OH, United StatesHQ checked Sep 16, 2026	11-50	63 contacts →
	Indirect evidence “Ephoca is the US subsidiary of Innova SRL - Via 1° Maggio, 8 – 38089 Storo (TN) Italy” Source: RevenueBase Database · checked Sep 16, 2026
10	Allied Well Drilling	Indirect evidence	Laurel, MD, United StatesHQ checked Sep 16, 2026	51-200	52 contacts →
	Indirect evidence “We at Allied Well Drilling are a full service commercial and residential gethermal heating/cooling system installer, specializing in vertically drilled closed loop systems.” Source: RevenueBase Database · checked Sep 16, 2026
11	AIR Comfort INC	Indirect evidence	Jenks, United StatesHQ checked Sep 16, 2026	51-200	42 contacts →
	Indirect evidence “Air Comfort, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
12	Darcy Solutions	Partial evidence	New Brighton, MN, United StatesHQ checked Sep 16, 2026	11-50	38 contacts →
	Partial evidence “Darcy Solutions is on a mission to put Geothermal Everywhere.” Source: RevenueBase Database · checked Sep 16, 2026
13	FORGE	Indirect evidence	Newton, MA, United StatesHQ checked Sep 16, 2026	51-200	37 contacts →
	Indirect evidence “Forge makes home comfort simple and sustainable with energy-efficient heat pump installations.” Source: RevenueBase Database · checked Sep 16, 2026
14	XGS Energy	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 16, 2026	11-50	34 contacts →
	Partial evidence “XGS Energy is a geothermal energy company founded and headquartered in Palo Alto, CA.” Source: RevenueBase Database · checked Sep 16, 2026
15	Nyle Systems, LLC	Indirect evidence	Brewer, ME, United StatesHQ checked Sep 16, 2026	51-200	33 contacts →
	Indirect evidence “Nyle is a US based manufacturing company, based in Brewer, Maine.” Source: RevenueBase Database · checked Sep 16, 2026
16	Midwest Geothermal	Partial evidence	Grand Rapids, MI, United StatesHQ checked Sep 16, 2026	11-50	28 contacts →
	Partial evidence “Geothermal Systems are becoming a critical component in the effort to make buildings more environmentally friendly.” Source: RevenueBase Database · checked Sep 16, 2026
17	Bedrock Energy	Partial evidence	Austin, TX, United StatesHQ checked Sep 16, 2026	11-50	27 contacts →
	Partial evidence “Our mission is to transform the heating & cooling of buildings, using geothermal energy to radically reduce costs for people and the environment.” Source: RevenueBase Database · checked Sep 16, 2026
18	Diedrich Drill	Strong evidence	La Porte, IN, United StatesHQ checked Sep 16, 2026	11-50	27 contacts →
	Strong evidence “Diedrich Drill is a full service manufacturer of top quality drilling equipment for the geotechnical, environmental, geothermal, and groundwater industries.” Source: RevenueBase Database · checked Sep 16, 2026
19	Fisen Corporation	Indirect evidence	Dutton, MI, United StatesHQ checked Sep 16, 2026	11-50	25 contacts →
	Indirect evidence “At Fisen, we foster innovation to supply you with cutting edge heating and cooling solutions, from controls through energy recovery.” Source: RevenueBase Database · checked Sep 16, 2026
20	Greenfire Energy INC	Partial evidence	Oklahoma City, OK, United StatesHQ checked Sep 16, 2026	11-50	23 contacts →
	Partial evidence “About GreenFire Energy GreenFire Energy engineers next-generation geothermal systems designed for real-world operating conditions.” Source: RevenueBase Database · checked Sep 16, 2026
21	Symbiont Service Corp	Partial evidence	Englewood, FL, United StatesHQ checked Sep 16, 2026	11-50	23 contacts →
	Partial evidence “Offering high quality, Energy Efficient and Eco-Friendly Geothermal Pool / Spa Heating & Cooling as well as Geothermal Air Conditioning in the whole state of Florida.” Source: RevenueBase Database · checked Sep 16, 2026
22	Open Mountain Energy	Partial evidence	Reno, NV, United StatesHQ checked Sep 16, 2026	11-50	22 contacts →
	Partial evidence “Open Mountain Energy combines its geothermal and project development expertise with Kaishan Group's power plant technologies and manufacturing to form a cutting-edge industry…” Source: RevenueBase Database · checked Sep 16, 2026
23	AUX AIR USA	Indirect evidence	South Plainfield, NJ, United StatesHQ checked Sep 16, 2026	n/a	19 contacts →
	Indirect evidence “AUX AIR USA is a leading provider of innovative, energy-efficient HVAC solutions, bringing superior climate control to homes and businesses across the United States.” Source: RevenueBase Database · checked Sep 16, 2026
24	Sumzero Energy Systems	Indirect evidence	Holliston, MA, United StatesHQ checked Sep 16, 2026	11-50	18 contacts →
	Indirect evidence “We are a team of experienced professionals who are dedicated to providing high-quality, energy-efficient heating & cooling solutions for our customers.” Source: RevenueBase Database · checked Sep 16, 2026
25	Eagle Mountain	Indirect evidence	Canandaigua, United StatesHQ checked Sep 16, 2026	11-50	18 contacts →
	Indirect evidence “Eagle Mountain is committed to the design and application of products and methods to reduce energy consumption and create a sustainable future for the earth while ensuring the…” Source: RevenueBase Database · checked Sep 16, 2026

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: geothermal equipment manufacturers. 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 geothermal equipment manufacturers.
Partial evidence: Its own public description names part of geothermal equipment manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal equipment manufacturers. 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 234 geothermal equipment manufacturers based in the United States

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Geothermal equipment manufacturers based in the United States at a glance

As of Sep 16, 2026

37.8%Verified-email coverage

17.9Average contacts per company

11-50Median size (employees)

3.4%Largest-city concentration · Houston

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

116

11-50

51-200

201-500

501-1,000

1,001-5,000

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 234 companies.

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 geothermal equipment manufacturers, 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “geothermal equipment manufacturers”. 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 geothermal equipment manufacturers), 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 geothermal equipment manufacturers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 1,580 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 16, 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.

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 geothermal equipment manufacturers, 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 geothermal equipment manufacturers are there based in the United States?

RevenueBase identified 234 geothermal equipment manufacturers headquartered in the United States 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?

Ormat Technologies, INC, headquartered in Reno, tops this list with the largest team on record.

Which city has the most geothermal equipment manufacturers?

Houston leads with 8 headquartered companies, followed by Austin (4) and Oklahoma City (4).

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 1,580 verified decision-maker contacts tracked across these 234 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 16, 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.