Company lists · Data refreshed September 2026

Top 25 Climate tech companies based in the United States

Name: Climate tech 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 19, 2026 634 companies tracked

RevenueBase identified 634 climate tech companies headquartered in the United States as of September 2026 and tracks 22,205 professional contacts across them, including 9,969 with verified work emails. New York is the largest hub.

This list covers climate tech companies 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 19, 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 19, 2026 86% judged on-target in blind review

634Companies

22,205Contacts tracked

9,969Verified emails

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The 25 largest climate tech companies based in the United States

Ranked by team size

Top 25 of 634 climate tech companies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to climate tech companies: 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	Carrier	Partial evidence	Palm Beach Gardens, FL, United StatesHQ checked Sep 19, 2026	10001+	7,665 contacts →
	Partial evidence “Carrier is a global leader in intelligent climate and energy solutions, pioneering sustainable innovations in climate technologies.” Source: RevenueBase Database · checked Sep 19, 2026
2	Mckinstry	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,213 contacts →
	Partial evidence “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Source: RevenueBase Database · checked Sep 19, 2026
3	Clearesult	Indirect evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,121 contacts →
	Indirect evidence “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Source: RevenueBase Database · checked Sep 19, 2026
4	Franklin Energy	Indirect evidence	Port Washington, WI, United StatesHQ checked Sep 19, 2026	1,001-5,000	838 contacts →
	Indirect evidence “Franklin Energy delivers end-to-end sustainability solutions through a portfolio of intelligent products and services that lower energy costs, reduce carbon and waste, and grow…” Source: RevenueBase Database · checked Sep 19, 2026
5	Energy Solutions	Partial evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	201-500	772 contacts →
	Partial evidence “Our mission is simple - to combat climate change through market-based, cost-effective energy, carbon, and water management solutions that make big impacts.” Source: RevenueBase Database · checked Sep 19, 2026
6	GTI Energy	Indirect evidence	Des Plaines, IL, United StatesHQ checked Sep 19, 2026	201-500	513 contacts →
	Indirect evidence “For more than eight decades, GTI Energy has contributed to the strengthening of energy systems and the communities they serve.” Source: RevenueBase Database · checked Sep 19, 2026
7	VEIC	Indirect evidence	Winooski, VT, United StatesHQ checked Sep 19, 2026	201-500	326 contacts →
	Indirect evidence “For 40 years, VEIC has helped energy leaders nationwide meet their clean energy goals.” Source: RevenueBase Database · checked Sep 19, 2026
8	3degrees Group, INC	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	201-500	324 contacts →
	Partial evidence “3Degrees is a leading global climate solutions provider, pioneer of environmental markets, and Certified B Corporation.” Source: RevenueBase Database · checked Sep 19, 2026
9	ARQ	Indirect evidence	Greenwood Village, CO, United StatesHQ checked Sep 19, 2026	201-500	234 contacts →
	Indirect evidence “Arq is a diversified, environmental technology company with products that enable a cleaner and safer planet while actively reducing our environmental impact.” Source: RevenueBase Database · checked Sep 19, 2026
10	Aeroseal	Strong evidence	Miamisburg, OH, United StatesHQ checked Sep 19, 2026	51-200	215 contacts →
	Strong evidence “Aeroseal is a climate tech company on a mission - reduce the world's carbon emissions by 1 gigaton annually.” Source: RevenueBase Database · checked Sep 19, 2026
11	Energy & Environmental Research Center	Indirect evidence	Grand Forks, ND, United StatesHQ checked Sep 19, 2026	201-500	213 contacts →
	Indirect evidence “The Energy & Environmental Research Center (EERC) is recognized as one of the world's leading developers of cleaner, more efficient energy to power the world and environmental…” Source: RevenueBase Database · checked Sep 19, 2026
12	Dalkia Energy Solutions	Indirect evidence	Beverly, MA, United StatesHQ checked Sep 19, 2026	201-500	210 contacts →
	Indirect evidence “Dalkia Energy Solutions, a subsidiary of the EDF (Électricité de France) Group, is a national leader in energy efficiency and sustainability for commercial, industrial, and…” Source: RevenueBase Database · checked Sep 19, 2026
13	Center For Energy And Environment	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 19, 2026	51-200	203 contacts →
	Indirect evidence “CEE is a community-based clean energy nonprofit with special expertise in energy efficiency that stretches back 40 years.” Source: RevenueBase Database · checked Sep 19, 2026
14	Anew Climate	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	200 contacts →
	Partial evidence “Anew Climate is a global leader of diverse climate solutions, bringing innovative products and services to the public and private sectors to help reduce or offset their carbon…” Source: RevenueBase Database · checked Sep 19, 2026
15	Ever-Green Energy	Indirect evidence	Saint Paul, MN, United StatesHQ checked Sep 19, 2026	201-500	191 contacts →
	Indirect evidence “Ever-Green Energy is a recognized leader in energy conservation and the use of renewable energy.” Source: RevenueBase Database · checked Sep 19, 2026
16	Carbon Direct	Partial evidence	New York, United StatesHQ checked Sep 19, 2026	51-200	172 contacts →
	Partial evidence “Carbon Direct is a trusted energy and climate solutions company that combines world-class scientific expertise, technical rigor, and market insights to help clients achieve their…” Source: RevenueBase Database · checked Sep 19, 2026
17	Clean AIR Task Force	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	167 contacts →
	Indirect evidence “CATF advocates for the change in technologies and policies needed to get to a zero-emissions, high-energy planet at an affordable cost.” Source: RevenueBase Database · checked Sep 19, 2026
18	Breakthrough Energy	Indirect evidence	Kirkland, United StatesHQ checked Sep 19, 2026	51-200	159 contacts →
	Indirect evidence “Breakthrough Energy backs companies developing the next generation of clean energy solutions.” Source: RevenueBase Database · checked Sep 19, 2026
19	Cleanchoice Energy	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	155 contacts →
	Partial evidence “CleanChoice Energy is a cleantech company that empowers people and businesses to easily access climate solutions.” Source: RevenueBase Database · checked Sep 19, 2026
20	Slipstream	Indirect evidence	Madison, WI, United StatesHQ checked Sep 19, 2026	51-200	146 contacts →
	Indirect evidence “We're a nonprofit headquartered in Madison, WI with an office in Chicago and remote staff across the U.S.” Source: RevenueBase Database · checked Sep 19, 2026
21	Connectm Technology Solutions	Indirect evidence	Marlborough, MA, United StatesHQ checked Sep 19, 2026	51-200	131 contacts →
	Indirect evidence “ConnectM is a clean energy technology and solutions provider for residential and light commercial buildings and all-electric original equipment manufacturers with a proprietary…” Source: RevenueBase Database · checked Sep 19, 2026
22	Phononic INC	Indirect evidence	Durham, NC, United StatesHQ checked Sep 19, 2026	51-200	106 contacts →
	Indirect evidence “Phononic, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
23	Greentown Labs	Partial evidence	Somerville, MA, United StatesHQ checked Sep 19, 2026	51-200	94 contacts →
	Partial evidence “Greentown Labs is a 501(c)(3) nonprofit accelerating climatetech innovation for the planet, people, and prosperity.” Source: RevenueBase Database · checked Sep 19, 2026
24	Puresky Energy	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	51-200	86 contacts →
	Indirect evidence “We lead the charge in providing renewable energy solutions that invigorate progress, enhance lives, and leave a legacy of environmental stewardship.” Source: RevenueBase Database · checked Sep 19, 2026
25	Syzygy Plasmonics	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	80 contacts →
	Indirect evidence “Syzygy Plasmonics is a technology company decarbonizing chemical production with its proprietary light-driven reactor technology.” Source: RevenueBase Database · checked Sep 19, 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: climate tech companies. 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 climate tech companies.
Partial evidence: Its own public description names part of climate tech companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name climate tech companies. 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 634 climate tech companies based in the United States

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Climate tech companies based in the United States at a glance

As of Sep 19, 2026

44.9%Verified-email coverage

35.0Average contacts per company

1-10Median size (employees)

6.2%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

388

11-50

164

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 634 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 climate tech companies, 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 “climate tech companies”. 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 climate tech companies), 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 climate tech companies, 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, 9,969 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 19, 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.

Climate tech companies by metro

Climate tech companies in New York39
Climate tech companies in Houston34

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 climate tech companies, 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 climate tech companies are there based in the United States?

RevenueBase identified 634 climate tech companies 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?

Carrier, headquartered in Palm Beach Gardens, tops this list with the largest team on record.

Which city has the most climate tech companies?

New York leads with 39 headquartered companies, followed by Houston (34) and San Francisco (23).

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 9,969 verified decision-maker contacts tracked across these 634 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 19, 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.