Company lists · Data refreshed October 2026

Top 25 Geothermal retrofit contractors based in the United States

Name: Geothermal retrofit 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 411 companies tracked

RevenueBase identified 411 company matches for geothermal retrofit contractors associated with the United States as of October 2026 and tracks 3,074 professional contacts across them, including 1,036 with verified work emails. Rochester is the largest hub.

This list covers company matches for geothermal retrofit 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

411Companies

3,074Contacts tracked

1,036Verified emails

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The 25 largest geothermal retrofit contractors based in the United States

Ranked by team size

Top 25 of 411 company matches for geothermal retrofit 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	Waterfurnace International	Exact match	Fort Wayne, IN, United StatesHQ recorded Oct 13, 2026	201-500	225 contacts →
	Exact match “WaterFurnace International, Inc.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
2	Dandelion Energy	Exact match	Mount Kisco, NY, United StatesHQ recorded Oct 13, 2026	51-200	130 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 · Oct 13, 2026 · View company records in RevenueBase
3	Brightcore Energy	Exact match	Armonk, NY, United StatesHQ recorded Oct 13, 2026	51-200	103 contacts →
	Exact match “Brightcore Energy is a leading renewable energy solutions provider serving commercial, institutional, and government clients.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
4	Enertech Global, LLC	Exact match	Greenville, IL, United StatesHQ recorded Oct 13, 2026	51-200	76 contacts →
	Exact match “Enertech Global is a leading manufacturer and visionary in the geothermal heating and cooling industry.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
5	Energy 1	Exact match	Bozeman, MT, United StatesHQ recorded Oct 13, 2026	201-500	75 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 · Oct 13, 2026 · View company records in RevenueBase
6	Roscoe Brown, INC	Exact match	Murfreesboro, TN, United StatesHQ recorded Oct 13, 2026	51-200	61 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
7	Dual Fuel	Exact match	Mount Vernon, NY, United StatesHQ recorded Oct 13, 2026	51-200	60 contacts →
	Exact match “Dual Fuel is a Licensed Master Plumber, General Contractor, NYSERDA Real Time Energy Management (RTEM) System and Service Provider, Coned C&I Partner, Coned Multifamily Partner…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
8	Sierra Pacific Home & Comfort, INC	Exact match	Rancho Cordova, CA, United StatesHQ recorded Oct 13, 2026	51-200	56 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 · Oct 13, 2026 · View company records in RevenueBase
9	Darcy Solutions	Exact match	New Brighton, MN, United StatesHQ recorded Oct 13, 2026	11-50	52 contacts →
	Exact match “Darcy Solutions is on a mission to put Geothermal Everywhere.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
10	Allied Well Drilling	Exact match	Laurel, MD, United StatesHQ recorded Oct 13, 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 · Oct 13, 2026 · View company records in RevenueBase
11	MAJOR	Exact match	Wheat Ridge, CO, United StatesHQ recorded Oct 13, 2026	11-50	51 contacts →
	Exact match “As Denver HVAC specialists and geothermal system experts, we believe in doing things right!” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
12	FORGE	Exact match	Newton, MA, United StatesHQ recorded Oct 13, 2026	51-200	40 contacts →
	Exact match “Forge makes home comfort simple and sustainable with energy-efficient heat pump installations.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
13	Greentech Energy Services	Exact match	Maple Shade, NJ, United StatesHQ recorded Oct 13, 2026	11-50	38 contacts →
	Exact match “GreenTech Energy Services is an innovative energy efficiency company specializing in lighting retrofits.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
14	Team Bob's Heating Cooling Plumbing	Exact match	Traverse City, MI, United StatesHQ recorded Oct 13, 2026	51-200	33 contacts →
	Exact match “Team Bob’s Heating Cooling Plumbing has been a commercial and residential HVAC and plumbing service and installation company serving Northern Michigan for nearly 40 years.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
15	XGS Energy	Exact match	Palo Alto, CA, United StatesHQ recorded Oct 13, 2026	11-50	33 contacts →
	Exact match “XGS Energy is a geothermal energy company founded and headquartered in Palo Alto, CA.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
16	Building Energy	Exact match	Williston, VT, United StatesHQ recorded Oct 13, 2026	11-50	32 contacts →
	Exact match “Building Energy is a comprehensive energy services company serving Vermont.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
17	Lind's Plumbing And Heating, INC	Exact match	Fort Collins, CO, United StatesHQ recorded Oct 13, 2026	51-200	31 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
18	John Betlem Heating & Cooling	Exact match	Rochester, NY, United StatesHQ recorded Oct 13, 2026	51-200	29 contacts →
	Exact match “John Betlem started the company in 1941, and John Betlem Heating & Cooling, Inc.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
19	Midwest Geothermal	Exact match	Grand Rapids, MI, United StatesHQ recorded Oct 13, 2026	11-50	28 contacts →
	Exact match “Geothermal Systems are becoming a critical component in the effort to make buildings more environmentally friendly.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
20	Century Mechanical Contractors,inc	Exact match	Fort Worth, TX, United StatesHQ recorded Oct 13, 2026	51-200	28 contacts →
	Exact match “Since 1974, Century Mechanical Contractors, Inc.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
21	Sustainable Energy Systems, LLC	Exact match	Frederick, MD, United StatesHQ recorded Oct 13, 2026	11-50	28 contacts →
	Exact match “SES designs, installs, and services solar water heating systems, photovoltaic systems, solar pool heating systems, radiant floor heating systems, and wood-fired boilers.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
22	Bedrock Energy	Exact match	Austin, TX, United StatesHQ recorded Oct 13, 2026	11-50	27 contacts →
	Exact match “Our mission is to transform the heating & cooling of buildings, using geothermal energy to radically reduce costs for people and the environment.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
23	Arronco Comfort AIR	Exact match	Burlington, KY, United StatesHQ recorded Oct 13, 2026	51-200	27 contacts →
	Exact match “Arronco Comfort Air, Inc.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
24	Balanced Comfort Cooling, Heating & Plumbing	Exact match	Fresno, CA, United StatesHQ recorded Oct 13, 2026	51-200	26 contacts →
	Exact match “Balanced Comfort was founded to improve the comfort and efficiency of existing buildings.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
25	Greenfire Energy INC	Exact match	Oklahoma City, OK, United StatesHQ recorded Oct 13, 2026	11-50	25 contacts →
	Exact match “About GreenFire Energy GreenFire Energy engineers next-generation geothermal systems designed for real-world operating conditions.” 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 retrofit 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 411 geothermal retrofit contractors based in the United States

See the full list, filter by size, metro and specialty, and access 1,036 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Geothermal retrofit contractors based in the United States at a glance

As of Oct 13, 2026

33.7%Verified-email coverage

7.5Average contacts per company

1-10Median size (employees)

1.2%Largest-city concentration · Rochester

Oct 13, 2026Page data refreshed

Companies by employee count

1-10

208

11-50

166

51-200

201-500

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 411 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 retrofit 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 1,036 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.

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 retrofit contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 411 company matches for geothermal retrofit 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?

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

Which city has the most geothermal retrofit contractors?

Rochester leads with 5 company records, followed by Austin (4) and Santa Rosa (4).

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 1,036 professional contacts with verified work emails tracked across these 411 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.