Company lists · Data refreshed September 2026

Top 25 Residential energy efficiency companies based in the United States

Name: Residential energy efficiency 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 17, 2026 3,439 companies tracked

RevenueBase identified 3,439 company matches for residential energy efficiency companies associated with the United States as of September 2026 and tracks 54,001 professional contacts across them, including 17,777 with verified work emails. Houston is the largest hub.

This list covers company matches for residential energy efficiency 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 17, 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 17, 2026 How this list was built

3,439Companies

54,001Contacts tracked

17,777Verified emails

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The 25 largest residential energy efficiency companies based in the United States

Ranked by team size

Top 25 of 3,439 company matches for residential energy efficiency companies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 17, 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	Generac	Exact match	Waukesha, WI, United StatesHQ recorded Sep 17, 2026	5,001-10,000	3,797 contacts →
	Exact match “Generac is the total energy solutions company powering a smarter world.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
2	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	2,121 contacts →
	Exact match “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
3	IGS Energy	Exact match	Dublin, OH, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,388 contacts →
	Exact match “IGS Energy has been a trusted energy advisor since 1989, growing into one of the nation’s top energy retailers.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
4	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,383 contacts →
	Exact match “Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
5	Blue Raven Solar	Exact match	Orem, UT, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,168 contacts →
	Exact match “Blue Raven Solar, a SunPower Company, is a retailer of residential home solar systems.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
6	ION Solar	Exact match	Provo, UT, United StatesHQ recorded Sep 17, 2026	501-1,000	912 contacts →
	Exact match “Ion Solar is a premium, full-service solar provider.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
7	Sunnova Energy	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	906 contacts →
	Exact match “Sunnova Energy International Inc.(NYSE: NOVA) is an industry-leading energy services company focused on making clean energy more accessible, reliable, and affordable for…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
8	LUMIO	Exact match	Lehi, UT, United StatesHQ recorded Sep 17, 2026	5,001-10,000	719 contacts →
	Exact match “We’re on a mission to make power personal.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
9	Palmetto	Exact match	Charlotte, NC, United StatesHQ recorded Sep 17, 2026	201-500	539 contacts →
	Exact match “Palmetto is a leading clean tech company on a mission to accelerate the transition to a clean energy future.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
10	Posigen	Exact match	St. Rose, LA, United StatesHQ recorded Sep 17, 2026	501-1,000	507 contacts →
	Exact match “PosiGen is the nation's leading residential solar and energy efficiency provider.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
11	Noresco	Exact match	Westborough, MA, United StatesHQ recorded Sep 17, 2026	201-500	481 contacts →
	Exact match “NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
12	Arcxis	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	389 contacts →
	Exact match “ARCXIS (Formerly DPIS Builder Services), is the largest provider of HERS inspections, ENERGY STAR ratings, engineering and design, construction quality assurance and other builder…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
13	Supernova	Exact match	Irvine, CA, United StatesHQ recorded Sep 17, 2026	201-500	370 contacts →
	Exact match “Supernova embodies the spirit of innovation and dedication to a sustainable future, making it a shining example of what it means to be a leader in the renewable energy industry.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
14	V3 Electric, INC	Exact match	El Dorado Hills, CA, United StatesHQ recorded Sep 17, 2026	201-500	368 contacts →
	Exact match “V3 was founded as a response to the stagnation within the energy industry.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
15	Budderfly	Exact match	Shelton, CT, United StatesHQ recorded Sep 17, 2026	201-500	366 contacts →
	Exact match “Budderfly is redefining how energy efficiency, resilience, and grid participation can work together across America’s commercial sector.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
16	Homeworks Energy, INC	Exact match	Medford, MA, United StatesHQ recorded Sep 17, 2026	201-500	356 contacts →
	Exact match “At HomeWorks Energy, our mission is simple, literally: Energy Efficiency, Simplified.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
17	OUR World Energy	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 17, 2026	201-500	351 contacts →
	Exact match “https://ourworldenergy.com/” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
18	Semper Solaris	Exact match	El Cajon, CA, United StatesHQ recorded Sep 17, 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 17, 2026 · View company records in RevenueBase
19	Purelight Power	Exact match	Medford, OR, United StatesHQ recorded Sep 17, 2026	51-200	300 contacts →
	Exact match “Founded in 2017, Purelight Power has quickly grown to be one of the nations largest residential solar installer.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
20	Everlight Solar	Exact match	Verona, WI, United StatesHQ recorded Sep 17, 2026	51-200	294 contacts →
	Exact match “Everlight Solar provides homeowners with simple and affordable clean energy.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
21	Meraki Solar	Exact match	Pensacola, FL, United StatesHQ recorded Sep 17, 2026	1,001-5,000	275 contacts →
	Exact match “People.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
22	Apex Energy Solutions	Exact match	Zionsville, IN, United StatesHQ recorded Sep 17, 2026	51-200	260 contacts →
	Exact match “A pioneering dealer for next-generation windows and eco-friendly building products, Apex Energy Solutions serves homeowners who value and love the place they call home.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
23	Infinity Energy INC	Exact match	Rocklin, CA, United StatesHQ recorded Sep 17, 2026	201-500	258 contacts →
	Exact match “Infinity Energy, we exist to power you At Infinity Energy we connect people to clean energy and customized home solutions.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
24	CMC Energy Services	Exact match	Fort Washington, PA, United StatesHQ recorded Sep 17, 2026	201-500	252 contacts →
	Exact match “CMC Energy Services is a woman-owned full-service energy efficiency company with nearly 50 years of experience delivering value-based energy conservation services.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
25	Savant Systems	Exact match	Hyannis, MA, United StatesHQ recorded Sep 17, 2026	201-500	250 contacts →
	Exact match “Savant is a global leader in smart home and energy, and traditional lighting solutions, for consumers, businesses, utility companies and more.” Recorded in the RevenueBase company graph · Sep 17, 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 “residential energy efficiency 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 3,439 residential energy efficiency companies based in the United States

See the full list, filter by size, metro and specialty, and access 17,777 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Residential energy efficiency companies based in the United States at a glance

As of Sep 17, 2026

32.9%Verified-email coverage

15.7Average contacts per company

11-50Median size (employees)

2.1%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,582

11-50

1,315

51-200

398

201-500

501-1,000

1,001-5,000

5,001-10,000

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 3,439 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 “residential energy efficiency 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 17,777 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 17, 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.

Residential energy efficiency companies by metro

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 “residential energy efficiency companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many residential energy efficiency companies are there based in the United States?

RevenueBase identified 3,439 company matches for residential energy efficiency 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?

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

Which city has the most residential energy efficiency companies?

Houston leads with 72 company records, followed by New York (72) and Austin (45).

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 17,777 professional contacts with verified work emails tracked across these 3,439 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 17, 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.