Company lists · Data refreshed September 2026

Top 25 Building systems integration companies based in the United States

Name: Building systems integration 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 27, 2026 4,864 companies tracked

RevenueBase identified 4,864 building systems integration companies headquartered in the United States as of September 2026 and tracks 124,856 professional contacts across them, including 55,107 with verified work emails. New York is the largest hub.

This list covers building systems integration 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 27, 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 27, 2026 86% judged on-target in blind review

4,864Companies

124,856Contacts tracked

55,107Verified emails

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The 25 largest building systems integration companies based in the United States

Ranked by team size

Top 25 of 4,864 building systems integration companies based in the United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to building systems integration 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	Convergint	Partial evidence	Hoffman Estates, IL, United StatesHQ checked Sep 27, 2026	10001+	5,707 contacts →
	Partial evidence “Convergint is a global systems integrator focused on delivering results for our customers through unparalleled service excellence.” Source: RevenueBase Database · checked Sep 27, 2026
2	M.C. Dean, INC	Indirect evidence	Tysons, VA, United StatesHQ checked Sep 27, 2026	5,001-10,000	2,761 contacts →
	Indirect evidence “M.C.” Source: RevenueBase Database · checked Sep 27, 2026
3	Southland Industries	Strong evidence	Garden Grove, CA, United StatesHQ checked Sep 27, 2026	10001+	2,439 contacts →
	Strong evidence “As one of the nation's largest building systems experts, Southland Industries provides innovative, practical results for your engineering, construction, service, and energy needs.” Source: RevenueBase Database · checked Sep 27, 2026
4	Acco Engineered Systems	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	5,001-10,000	2,415 contacts →
	Partial evidence “Since 1934, owners and builders have selected ACCO Engineered Systems to design, install, and maintain more than mechanical projects.” Source: RevenueBase Database · checked Sep 27, 2026
5	IES Communications	Indirect evidence	Tempe, AZ, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,800 contacts →
	Indirect evidence “IES Communications a division of IES (NASDAQ: IESC) provides each client with a team of highly qualified dedicated professionals that deliver superior quality and cost effective…” Source: RevenueBase Database · checked Sep 27, 2026
6	JR Automation	Partial evidence	Holland, MI, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,386 contacts →
	Partial evidence “JR Automation is a leading global integrator of custom automated systems for manufacturing and distribution environments around the world.” Source: RevenueBase Database · checked Sep 27, 2026
7	Comfort Systems USA	Partial evidence	Houston, TX, United StatesHQ checked Sep 27, 2026	10001+	1,330 contacts →
	Partial evidence “Comfort Systems USA \| Quality People.” Source: RevenueBase Database · checked Sep 27, 2026
8	Rovisys	Partial evidence	Aurora, OH, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,159 contacts →
	Partial evidence “As one of the world's largest independent systems integrators, RoviSys delivers comprehensive automation, digital transformation, manufacturing execution (MES), Industrial AI…” Source: RevenueBase Database · checked Sep 27, 2026
9	Automated Logic Corporation	Strong evidence	Kennesaw, GA, United StatesHQ checked Sep 27, 2026	501-1,000	1,115 contacts →
	Strong evidence “Automated Logic Corporation (ALC) provides innovative building automation and control systems.” Source: RevenueBase Database · checked Sep 27, 2026
10	Mckenney's, INC	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,077 contacts →
	Indirect evidence “McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.” Source: RevenueBase Database · checked Sep 27, 2026
11	Cmta, INC	Indirect evidence	Louisville, KY, United StatesHQ checked Sep 27, 2026	501-1,000	936 contacts →
	Indirect evidence “CMTA is part of Legence, a Nasdaq Listed company.” Source: RevenueBase Database · checked Sep 27, 2026
12	Stellar	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 27, 2026	501-1,000	899 contacts →
	Indirect evidence “Stellar, headquartered in Jacksonville, Florida, is a fully integrated firm focusing on design, engineering, construction, refrigeration, and mechanical and electrical services…” Source: RevenueBase Database · checked Sep 27, 2026
13	Prime Controls	Indirect evidence	Lewisville, TX, United StatesHQ checked Sep 27, 2026	1,001-5,000	857 contacts →
	Indirect evidence “Prime Controls was established as a Main Automation Contractor to provide customers a sole source solution for Industrial Automation services and products.” Source: RevenueBase Database · checked Sep 27, 2026
14	SASCO	Partial evidence	Fullerton, CA, United StatesHQ checked Sep 27, 2026	501-1,000	734 contacts →
	Partial evidence “SASCO has been a leader in electrical construction and low-voltage systems technologies for 50 years.” Source: RevenueBase Database · checked Sep 27, 2026
15	Albireo Energy	Partial evidence	Edison, NJ, United StatesHQ checked Sep 27, 2026	1,001-5,000	669 contacts →
	Partial evidence “Albireo Energy is a leading independent building controls and energy services provider recognized by customers for creating intelligent, high-performance buildings.” Source: RevenueBase Database · checked Sep 27, 2026
16	Baker Group	Indirect evidence	Ankeny, IA, United StatesHQ checked Sep 27, 2026	1,001-5,000	655 contacts →
	Indirect evidence “Established in 1963, Baker Group is Iowa’s premier full-service specialty contractor-serving commercial, industrial, institutional, and mission-critical markets across the country.” Source: RevenueBase Database · checked Sep 27, 2026
17	E Tech Group	Strong evidence	West Chester, OH, United StatesHQ checked Sep 27, 2026	501-1,000	610 contacts →
	Strong evidence “E Tech Group is one of the largest engineering and system integration firms in the United States.” Source: RevenueBase Database · checked Sep 27, 2026
18	Alterman, INC	Indirect evidence	Live Oak, TX, United StatesHQ checked Sep 27, 2026	501-1,000	597 contacts →
	Indirect evidence “Since 1923, Alterman has provided electrical construction on many of San Antonio and Austin's most impressive landmarks and contemporary structures.” Source: RevenueBase Database · checked Sep 27, 2026
19	F.E. Moran Group Of Companies	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 27, 2026	1,001-5,000	564 contacts →
	Indirect evidence “At F.E.” Source: RevenueBase Database · checked Sep 27, 2026
20	Rovisys Building Technologies	Strong evidence	Aurora, OH, United StatesHQ checked Sep 27, 2026	1,001-5,000	547 contacts →
	Strong evidence “As part of the RoviSys family of companies, we deliver vendor independent building automation, electrical power management, facility monitoring, and systems integration solutions…” Source: RevenueBase Database · checked Sep 27, 2026
21	Environmental AIR Systems	Partial evidence	High Point, NC, United StatesHQ checked Sep 27, 2026	1,001-5,000	545 contacts →
	Partial evidence “For generations, EAS Companies has been an innovative provider delivering complete solutions in mechanical, electrical, plumbing, building services, controls, and engineered…” Source: RevenueBase Database · checked Sep 27, 2026
22	Deem, LLC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 27, 2026	1,001-5,000	539 contacts →
	Indirect evidence “DEEM, LLC is a mechanical and electrical company centrally located in Fishers, Indiana with satellite offices throughout the Midwest down to the southeastern United States.” Source: RevenueBase Database · checked Sep 27, 2026
23	U.S. Engineering	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 27, 2026	501-1,000	538 contacts →
	Indirect evidence “U.S.” Source: RevenueBase Database · checked Sep 27, 2026
24	P1 Construction, LLC	Indirect evidence	Lenexa, KS, United StatesHQ checked Sep 27, 2026	1,001-5,000	497 contacts →
	Indirect evidence “P1 is built to bring trusted partnerships, facilities, and the communities we serve to life.” Source: RevenueBase Database · checked Sep 27, 2026
25	Amteck, LLC	Indirect evidence	Lexington, KY, United StatesHQ checked Sep 27, 2026	501-1,000	474 contacts →
	Indirect evidence “Amteck is one of Kentucky’s largest privately held electrical construction firms, providing design-build electrical construction services for a wide variety of facilities…” Source: RevenueBase Database · checked Sep 27, 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: building systems integration 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 building systems integration companies.
Partial evidence: Its own public description names part of building systems integration companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name building systems integration 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 4,864 building systems integration companies based in the United States

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Building systems integration companies based in the United States at a glance

As of Sep 27, 2026

44.1%Verified-email coverage

25.7Average contacts per company

11-50Median size (employees)

1.9%Largest-city concentration · New York

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

1,856

11-50

1,944

51-200

767

201-500

162

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 4,864 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 building systems integration 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 “building systems integration 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 building systems integration 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 building systems integration 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, 55,107 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 27, 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.

Building systems integration companies by metro

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 building systems integration 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 building systems integration companies are there based in the United States?

RevenueBase identified 4,864 building systems integration 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?

Convergint, headquartered in Hoffman Estates, tops this list with the largest team on record.

Which city has the most building systems integration companies?

New York leads with 94 headquartered companies, followed by Houston (85) and Los Angeles (55).

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 55,107 verified decision-maker contacts tracked across these 4,864 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 27, 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.