Company lists · Data refreshed September 2026

Top 25 Geothermal energy installation companies based in the United States

Name: Geothermal energy 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 15, 2026 1,400 companies tracked

RevenueBase identified 1,400 company matches for geothermal energy installation companies associated with the United States as of September 2026 and tracks 17,019 professional contacts across them, including 6,356 with verified work emails. Houston is the largest hub.

This list covers company matches for geothermal energy 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 15, 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 15, 2026 How this list was built

1,400Companies

17,019Contacts tracked

6,356Verified emails

Explore this list → Free signup · no credit card · 500 free credits

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

Ranked by team size

Top 25 of 1,400 company matches for geothermal energy installation companies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 15, 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	Calpine	Exact match	Houston, TX, United StatesHQ recorded Sep 15, 2026	1,001-5,000	2,112 contacts →
	Exact match “A business unit of Constellation (NASDAQ: CEG), Calpine Corporation is America’s largest generator of electricity from natural gas and geothermal resources with operations in…” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
2	Ormat Technologies, INC	Exact match	Reno, NV, United StatesHQ recorded Sep 15, 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 15, 2026 · View company records in RevenueBase
3	Semper Solaris	Exact match	El Cajon, CA, United StatesHQ recorded Sep 15, 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 15, 2026 · View company records in RevenueBase
4	Grupo IPS	Exact match	Conroe, TX, United StatesHQ recorded Sep 15, 2026	51-200	245 contacts →
	Exact match “IPS is an integrated oilfield service company with over 20 years in the business.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
5	Reliable Heating & AIR	Exact match	Kennesaw, GA, United StatesHQ recorded Sep 15, 2026	201-500	231 contacts →
	Exact match “Since 1978, Reliable Heating & Air has been serving all of Metro Atlanta's communities offering heating, cooling, plumbing and electrical services, indoor air quality, duct…” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
6	Waterfurnace International	Exact match	Fort Wayne, IN, United StatesHQ recorded Sep 15, 2026	201-500	224 contacts →
	Exact match “WaterFurnace International, Inc.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
7	Tolin Mechanical Systems	Exact match	Denver, CO, United StatesHQ recorded Sep 15, 2026	201-500	220 contacts →
	Exact match “Tolin Mechanical is a Leading Energy & Commercial HVAC Services Company.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
8	Holaday-Parks, INC	Exact match	Tukwila, WA, United StatesHQ recorded Sep 15, 2026	201-500	218 contacts →
	Exact match “As one of the largest full service mechanical contractors headquartered in the Pacific Northwest, Holaday Parks has grown well beyond Seattle.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
9	Airtron Heating & AIR Conditioning	Exact match	Columbus, OH, United StatesHQ recorded Sep 15, 2026	1,001-5,000	214 contacts →
	Exact match “Airtron has developed itself into one of the leading heating, ventilation, and air conditioning (HVAC) providers.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
10	Fervo Energy	Exact match	Houston, CA, United StatesHQ recorded Sep 15, 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 15, 2026 · View company records in RevenueBase
11	Haller Enterprises	Exact match	Lititz, PA, United StatesHQ recorded Sep 15, 2026	201-500	191 contacts →
	Exact match “Since 1981, Haller Enterprises has proudly served central and eastern Pennsylvania as a leader in heating, cooling, plumbing, and electrical services.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
12	Maxair Mechanical	Exact match	Marietta, GA, United StatesHQ recorded Sep 15, 2026	201-500	183 contacts →
	Exact match “MAXAIR Mechanical, founded in 1988, is a people first company.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
13	Emcor Services Aircond	Exact match	Smyrna, GA, United StatesHQ recorded Sep 15, 2026	201-500	178 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
14	Hill York	Exact match	Dania Beach, FL, United StatesHQ recorded Sep 15, 2026	201-500	168 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
15	GSM Services	Exact match	Gastonia, NC, United StatesHQ recorded Sep 15, 2026	201-500	159 contacts →
	Exact match “For nearly a century, GSM Services has built its reputation on reliability, honesty, expert service, and high-quality workmanship.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
16	Rondo Energy	Exact match	Alameda, CA, United StatesHQ recorded Sep 15, 2026	51-200	145 contacts →
	Exact match “We're hiring!” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
17	Baker Home Energy	Exact match	Escondido, CA, United StatesHQ recorded Sep 15, 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 15, 2026 · View company records in RevenueBase
18	Suntria	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 15, 2026	51-200	126 contacts →
	Exact match “Suntria is the deployment engine of EverPower.AI.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
19	Dandelion Energy	Exact match	Mount Kisco, NY, United StatesHQ recorded Sep 15, 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 15, 2026 · View company records in RevenueBase
20	Powers Building Hvac, Controls, And Service	Exact match	North Little Rock, AR, United StatesHQ recorded Sep 15, 2026	201-500	113 contacts →
	Exact match “Our goal at Powers is to make your buildings productive, comfortable, and efficient to operate.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
21	Encon Heating & A C	Exact match	Stratford, CT, United StatesHQ recorded Sep 15, 2026	201-500	110 contacts →
	Exact match “At ENCON, we take care of people.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
22	Lawyer Mechanical Services	Exact match	Las Vegas, NV, United StatesHQ recorded Sep 15, 2026	51-200	110 contacts →
	Exact match “Lawyer Mechanical Services (LMS) creates and maintains comfort.” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
23	Brightcore Energy	Exact match	Armonk, NY, United StatesHQ recorded Sep 15, 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 15, 2026 · View company records in RevenueBase
24	Atomatic Mechanical Services	Exact match	Arlington Heights, IL, United StatesHQ recorded Sep 15, 2026	51-200	96 contacts →
	Exact match “Meeting Your Needs.Exceeding Your Expectations" For over 70 years, Atomatic Mechanical Services has been dedicated to quality design, installation and service of HVAC systems for…” Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
25	Casa Mechanical Services	Exact match	Round Rock, TX, United StatesHQ recorded Sep 15, 2026	51-200	89 contacts →
	Exact match “CASA Mechanical is owned and operated by the W.G.” Recorded in the RevenueBase company graph · Sep 15, 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 energy 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 1,400 geothermal energy installation companies based in the United States

See the full list, filter by size, metro and specialty, and access 6,356 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

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

As of Sep 15, 2026

37.3%Verified-email coverage

12.2Average contacts per company

11-50Median size (employees)

2.1%Largest-city concentration · Houston

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

654

11-50

569

51-200

135

201-500

501-1,000

1,001-5,000

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 1,400 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 energy 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 6,356 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 15, 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 energy installation companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 1,400 company matches for geothermal energy 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?

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

Which city has the most geothermal energy installation companies?

Houston leads with 30 company records, followed by Denver (14) and Austin (11).

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 6,356 professional contacts with verified work emails tracked across these 1,400 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 15, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,400 geothermal energy installation companies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Geothermal energy installation companies by geography

Browse the directory

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.