Company lists · Data refreshed September 2026

Top 25 Geothermal heating installation companies based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 829 companies tracked

RevenueBase identified 829 company matches for geothermal heating installation companies associated with the United States as of September 2026 and tracks 7,595 professional contacts across them, including 2,743 with verified work emails. Houston is the largest hub.

This list covers company matches for geothermal heating installation companies 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 September 20, 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 Sep 20, 2026 How this list was built

829Companies

7,595Contacts tracked

2,743Verified emails

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The 25 largest geothermal heating installation companies based in the United States

Ranked by team size

Top 25 of 829 company matches for geothermal heating installation companies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 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	Ormat Technologies, INC	Exact match	Reno, NV, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,281 contacts →
	Exact match “With over five decades of experience, Ormat Technologies, Inc.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
2	Semper Solaris	Exact match	El Cajon, CA, United StatesHQ recorded Sep 20, 2026	501-1,000	337 contacts →
	Exact match “Ranked #1 in Solar + Battery Installation in America by "Solar Power World" Go Solar American Style!#1 Veteran Owned Solar Company in California Solar Panels.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
3	Waterfurnace International	Exact match	Fort Wayne, IN, United StatesHQ recorded Sep 20, 2026	201-500	224 contacts →
	Exact match “WaterFurnace International, Inc.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
4	Fervo Energy	Exact match	Houston, CA, United StatesHQ recorded Sep 20, 2026	51-200	213 contacts →
	Exact match “Fervo Energy provides 24/7 carbon-free energy through the development of next-generation geothermal power.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
5	Baker Home Energy	Exact match	Escondido, CA, United StatesHQ recorded Sep 20, 2026	201-500	133 contacts →
	Exact match “We’ve made some exciting changes here at Baker and we want you to be the first to know.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
6	Dandelion Energy	Exact match	Mount Kisco, NY, United StatesHQ recorded Sep 20, 2026	51-200	118 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7	Encon Heating & A C	Exact match	Stratford, CT, United StatesHQ recorded Sep 20, 2026	201-500	110 contacts →
	Exact match “At ENCON, we take care of people.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8	Brightcore Energy	Exact match	Armonk, NY, United StatesHQ recorded Sep 20, 2026	51-200	108 contacts →
	Exact match “Brightcore Energy is a leading renewable energy solutions provider serving commercial, institutional, and government clients.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9	AIR Mechanical INC	Exact match	Ham Lake, MN, United StatesHQ recorded Sep 20, 2026	51-200	87 contacts →
	Exact match “Creating Custom Comfort since 1985!” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10	HALCO	Exact match	Phelps, NY, United StatesHQ recorded Sep 20, 2026	51-200	82 contacts →
	Exact match “Halco is a highly accredited, national award-winning contractor that has been providing high-quality solutions to residential and commercial clients since 1984.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11	Enertech Global, LLC	Exact match	Greenville, IL, United StatesHQ recorded Sep 20, 2026	51-200	81 contacts →
	Exact match “Enertech Global is a leading manufacturer and visionary in the geothermal heating and cooling industry.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12	Energy 1	Exact match	Bozeman, MT, United StatesHQ recorded Sep 20, 2026	201-500	72 contacts →
	Exact match “Energy 1 designs and installs state-of-the-art Mechanical, Electrical, and Plumbing systems that utilize renewable technologies and deliver efficiency, elegance, and legacies our…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13	Roscoe Brown, INC	Exact match	Murfreesboro, TN, United StatesHQ recorded Sep 20, 2026	51-200	65 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14	Quaise Energy	Exact match	Houston, MA, United StatesHQ recorded Sep 20, 2026	51-200	62 contacts →
	Exact match “Quaise develops superhot geothermal power plants for a terawatt-scale world.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15	Sierra Pacific Home & Comfort, INC	Exact match	Rancho Cordova, CA, United StatesHQ recorded Sep 20, 2026	51-200	53 contacts →
	Exact match “When you turn to us for your homes' energy efficient upgrade, you can take comfort in knowing you've made the right choice for your Plumbing, Electrical, Solar or Heating and Air…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16	JK Mechanical, INC	Exact match	Willow Street, PA, United StatesHQ recorded Sep 20, 2026	51-200	52 contacts →
	Exact match “JK Mechanical provides Smart Energy Solutions including Geothermal, Heating, Solar, Electrical, & More in Central Pennsylvania and Maryland.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
17	Allied Well Drilling	Exact match	Laurel, MD, United StatesHQ recorded Sep 20, 2026	51-200	52 contacts →
	Exact match “We at Allied Well Drilling are a full service commercial and residential gethermal heating/cooling system installer, specializing in vertically drilled closed loop systems.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18	Maynard	Exact match	Nashville, TN, United StatesHQ recorded Sep 20, 2026	51-200	52 contacts →
	Exact match “Maynard is a company with one focus: to be the community leader in climate solutions for Middle Tennessee.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19	MAJOR	Exact match	Wheat Ridge, CO, United StatesHQ recorded Sep 20, 2026	11-50	50 contacts →
	Exact match “As Denver HVAC specialists and geothermal system experts, we believe in doing things right!” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20	Team Sunshine Construction	Exact match	Boston, MA, United StatesHQ recorded Sep 20, 2026	51-200	48 contacts →
	Exact match “Team Sunshine is New England's Premier Solar Installation Company and has been helping New England Homeowners transition from fossil fuels to renewable energy since 2019.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21	AIR Comfort INC	Exact match	Jenks, United StatesHQ recorded Sep 20, 2026	51-200	42 contacts →
	Exact match “Air Comfort, Inc.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22	Darcy Solutions	Exact match	New Brighton, MN, United StatesHQ recorded Sep 20, 2026	11-50	38 contacts →
	Exact match “Darcy Solutions is on a mission to put Geothermal Everywhere.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23	FORGE	Exact match	Newton, MA, United StatesHQ recorded Sep 20, 2026	51-200	37 contacts →
	Exact match “Forge makes home comfort simple and sustainable with energy-efficient heat pump installations.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24	Solarcraft	Exact match	Novato, CA, United StatesHQ recorded Sep 20, 2026	11-50	37 contacts →
	Exact match “SolarCraft is 100% Employee-Owned and has been one of the largest green-tech employers based in the North Bay for over 40 years.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25	XGS Energy	Exact match	Palo Alto, CA, United StatesHQ recorded Sep 20, 2026	11-50	34 contacts →
	Exact match “XGS Energy is a geothermal energy company founded and headquartered in Palo Alto, CA.” Recorded in the RevenueBase company graph · Sep 20, 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 heating installation companies”. 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 829 geothermal heating installation companies based in the United States

See the full list, filter by size, metro and specialty, and access 2,743 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Geothermal heating installation companies based in the United States at a glance

As of Sep 20, 2026

36.1%Verified-email coverage

9.2Average contacts per company

1-10Median size (employees)

1.6%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

430

11-50

317

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 829 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 heating installation companies” 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 2,743 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 September 20, 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.

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 heating installation companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many geothermal heating installation companies are there based in the United States?

RevenueBase identified 829 company matches for geothermal heating installation companies associated with the United States as of September 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?

Ormat Technologies, INC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most geothermal heating installation companies?

Houston leads with 13 company records, followed by Austin (9) and Denver (7).

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 2,743 professional contacts with verified work emails tracked across these 829 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 September 20, 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.