Company lists · Data refreshed October 2026

Top 25 Commercial building energy system contractors based in the United States

Name: Commercial building energy system 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 10, 2026 4,819 companies tracked

RevenueBase identified 4,819 company matches for commercial building energy system contractors associated with the United States as of October 2026 and tracks 113,933 professional contacts across them, including 45,046 with verified work emails. New York is the largest hub.

This list covers company matches for commercial building energy system 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 10, 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 10, 2026 How this list was built

4,819Companies

113,933Contacts tracked

45,046Verified emails

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

The 25 largest commercial building energy system contractors based in the United States

Ranked by team size

Top 25 of 4,819 company matches for commercial building energy system contractors based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 10, 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	Southland Industries	Exact match	Garden Grove, CA, United StatesHQ recorded Oct 10, 2026	10001+	3,010 contacts →
	Exact match “As one of the nation's largest building systems experts, Southland Industries provides innovative, practical results for your engineering, construction, service, and energy needs.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
2	FTI	Exact match	Menasha, WI, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,979 contacts →
	Exact match “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
3	Acco Engineered Systems	Exact match	Pasadena, CA, United StatesHQ recorded Oct 10, 2026	5,001-10,000	2,573 contacts →
	Exact match “Since 1934, owners and builders have selected ACCO Engineered Systems to design, install, and maintain more than mechanical projects.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
4	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,293 contacts →
	Exact match “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
5	Emcor Group, INC	Exact match	Norwalk, CT, United StatesHQ recorded Oct 10, 2026	10001+	1,443 contacts →
	Exact match “A Fortune 500® company and a member of the S&P 500, EMCOR Group, Inc.(NYSE: EME) is a leader in mechanical and electrical construction, industrial and energy infrastructure, and…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
6	Macdonald-Miller Facility Solutions	Exact match	Seatac, WA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	1,365 contacts →
	Exact match “MacDonald-Miller Facility Solutions is a full-service, design-build mechanical contractor in the Pacific Northwest.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
7	Comfort Systems USA	Exact match	Houston, TX, United StatesHQ recorded Oct 10, 2026	10001+	1,354 contacts →
	Exact match “Comfort Systems USA \| Quality People.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
8	Facility Solutions Group	Exact match	Austin, TX, United StatesHQ recorded Oct 10, 2026	1,001-5,000	1,294 contacts →
	Exact match “Big jobs, complex systems, tight timelines.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
9	Henderson Engineers	Exact match	Lenexa, KS, United StatesHQ recorded Oct 10, 2026	501-1,000	1,096 contacts →
	Exact match “Henderson Engineers is a national building systems design firm with a wide array of engineering services and a portfolio representing a full range of markets including business…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
10	Mckenney's, INC	Exact match	Atlanta, GA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	1,088 contacts →
	Exact match “McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
11	Cmta, INC	Exact match	Louisville, KY, United StatesHQ recorded Oct 10, 2026	501-1,000	1,016 contacts →
	Exact match “CMTA is part of Legence, a Nasdaq Listed company.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
12	Archkey Solutions	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	1,001-5,000	880 contacts →
	Exact match “ArchKey, one of the largest privately held specialty trade installation and facilities services companies in the United States, is a leader in designing, building, and maintaining…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
13	PAE	Exact match	Portland, OR, United StatesHQ recorded Oct 10, 2026	201-500	835 contacts →
	Exact match “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
14	Limbach	Exact match	Tampa, FL, United StatesHQ recorded Oct 10, 2026	1,001-5,000	776 contacts →
	Exact match “Limbach is a leading building solutions firm delivering mission critical infrastructure that supports life’s most important moments.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
15	SEL Construction Corporation	Exact match	Loomis, CA, United StatesHQ recorded Oct 10, 2026	n/a	722 contacts →
	Exact match “Experienced commercial contractor specializing in renewable energy, electrical, and roofing projects for privately-owned buildings as well as state/local government buildings in…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
16	Climatec, LLC	Exact match	Phoenix, AZ, United StatesHQ recorded Oct 10, 2026	1,001-5,000	666 contacts →
	Exact match “Climatec has been making buildings safer, more comfortable and efficient for over 40 years.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
17	Albireo Energy	Exact match	Edison, NJ, United StatesHQ recorded Oct 10, 2026	1,001-5,000	658 contacts →
	Exact match “Albireo Energy is a leading independent building controls and energy services provider recognized by customers for creating intelligent, high-performance buildings.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
18	Alterman, INC	Exact match	Live Oak, TX, United StatesHQ recorded Oct 10, 2026	501-1,000	615 contacts →
	Exact match “Since 1923, Alterman has provided electrical construction on many of San Antonio and Austin's most impressive landmarks and contemporary structures.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
19	Nexamp	Exact match	Boston, MA, United StatesHQ recorded Oct 10, 2026	201-500	610 contacts →
	Exact match “Nexamp is leading the transformation to the new energy economy with proven solutions for the deployment and operation of solar energy assets.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
20	Colonialwebb	Exact match	Richmond, VA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	585 contacts →
	Exact match “ColonialWebb is built on a simple belief: when people feel like they belong and have a purpose, they can achieve almost anything.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
21	Therma	Exact match	San Jose, CA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	507 contacts →
	Exact match “Therma is part of Legence, a Blackstone portfolio company, specially created to be an Energy Transition Accelerator™.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
22	MSS Solutions, LLC	Exact match	Charlotte, NC, United StatesHQ recorded Oct 10, 2026	501-1,000	489 contacts →
	Exact match “Since 1996, MSS has made thousands of facilities more efficient, comfortable, secure and reliable for owners, operators and occupiers across the Carolinas and throughout North…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
23	Long Building Technologies	Exact match	Littleton, CO, United StatesHQ recorded Oct 10, 2026	501-1,000	484 contacts →
	Exact match “Since 1965, LONG has been in the business of building performance; making them automated, efficient, green, and safe.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
24	Noresco	Exact match	Westborough, MA, United StatesHQ recorded Oct 10, 2026	201-500	479 contacts →
	Exact match “NORESCO, an OPTERRA company, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
25	Guarantee Electrical Company	Exact match	St. Louis, MO, United StatesHQ recorded Oct 10, 2026	501-1,000	447 contacts →
	Exact match “A full-service electrical contractor since 1902, providing capability, performance, and legendary innovation in new construction, design-build, low-voltage systems, energy…” Recorded in the RevenueBase company graph · Oct 10, 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 “commercial building energy system 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 4,819 commercial building energy system contractors based in the United States

See the full list, filter by size, metro and specialty, and access 45,046 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Commercial building energy system contractors based in the United States at a glance

As of Oct 10, 2026

39.5%Verified-email coverage

23.6Average contacts per company

11-50Median size (employees)

2.2%Largest-city concentration · New York

Oct 10, 2026Page data refreshed

Companies by employee count

1-10

1,738

11-50

1,949

51-200

817

201-500

207

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 4,819 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 “commercial building energy system 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 45,046 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 10, 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.

Commercial building energy system contractors 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 “commercial building energy system contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many commercial building energy system contractors are there based in the United States?

RevenueBase identified 4,819 company matches for commercial building energy system 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?

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

Which city has the most commercial building energy system contractors?

New York leads with 105 company records, followed by Houston (80) and Denver (47).

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 45,046 professional contacts with verified work emails tracked across these 4,819 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 10, 2026.

Ready to reach these companies? Verified emails and direct dials for all 4,819 commercial building energy system contractors based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Commercial building energy system contractors 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.