Company lists · Data refreshed September 2026

Top 25 Mechanical systems integrators based in the United States

Name: Mechanical systems integrators based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 5,940 companies tracked

RevenueBase identified 5,940 mechanical systems integrators headquartered in the United States as of September 2026 and tracks 170,835 professional contacts across them, including 72,444 with verified work emails. Houston is the largest hub.

This list covers mechanical systems integrators 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 28, 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 28, 2026 86% judged on-target in blind review

5,940Companies

170,835Contacts tracked

72,444Verified emails

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The 25 largest mechanical systems integrators based in the United States

Ranked by team size

Top 25 of 5,940 mechanical systems integrators based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to mechanical systems integrators: 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	Strong evidence	Hoffman Estates, IL, United StatesHQ checked Sep 28, 2026	10001+	5,707 contacts →
	Strong evidence “Convergint is a global systems integrator focused on delivering results for our customers through unparalleled service excellence.” Source: RevenueBase Database · checked Sep 28, 2026
2	Southland Industries	Partial evidence	Garden Grove, CA, United StatesHQ checked Sep 28, 2026	10001+	2,439 contacts →
	Partial 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 28, 2026
3	Acco Engineered Systems	Strong evidence	Pasadena, CA, United StatesHQ checked Sep 28, 2026	5,001-10,000	2,415 contacts →
	Strong 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 28, 2026
4	GRAY	Indirect evidence	Lexington, KY, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,477 contacts →
	Indirect evidence “Founded by James Norris and Lois Howard Gray in 1960, Gray is a family-owned, fully integrated industrial design-builder specializing in engineering, architecture, construction…” Source: RevenueBase Database · checked Sep 28, 2026
5	Emcor Group, INC	Partial evidence	Norwalk, CT, United StatesHQ checked Sep 28, 2026	10001+	1,383 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 28, 2026
6	Comfort Systems USA	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	10001+	1,330 contacts →
	Partial evidence “Comfort Systems USA \| Quality People.” Source: RevenueBase Database · checked Sep 28, 2026
7	Macdonald-Miller Facility Solutions	Partial evidence	Seatac, WA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,303 contacts →
	Partial evidence “MacDonald-Miller Facility Solutions is a full-service, design-build mechanical contractor in the Pacific Northwest.” Source: RevenueBase Database · checked Sep 28, 2026
8	Aaon, INC	Indirect evidence	Tulsa, OK, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,208 contacts →
	Indirect evidence “Driving the industry forward through the design, manufacturing, and rigorous testing of premium HVAC equipment.” Source: RevenueBase Database · checked Sep 28, 2026
9	Englobal	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	201-500	1,183 contacts →
	Indirect evidence “Who We Are Englobal Founded in 1985, ENGlobal (NASDAQ: ENG) is a specialty engineering services firm that focuses on automation solutions and select EPCM projects for the energy…” Source: RevenueBase Database · checked Sep 28, 2026
10	Rovisys	Strong evidence	Aurora, OH, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,159 contacts →
	Strong 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 28, 2026
11	Mckenney's, INC	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 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 28, 2026
12	Henderson Engineers	Partial evidence	Lenexa, KS, United StatesHQ checked Sep 28, 2026	501-1,000	1,040 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 28, 2026
13	Harris	Partial evidence	St Paul, MN, United StatesHQ checked Sep 28, 2026	1,001-5,000	982 contacts →
	Partial evidence “Harris is a leading national mechanical contractor specializing in design and engineering, construction, controls, service, manufacturing, conveyors and end-to-end building…” Source: RevenueBase Database · checked Sep 28, 2026
14	Convergix Automation Solutions	Indirect evidence	Auburn Hills, MI, United StatesHQ checked Sep 28, 2026	501-1,000	942 contacts →
	Indirect evidence “Convergix Automation Solutions designs, engineers and integrates hardware and software to automate its customers' operations.” Source: RevenueBase Database · checked Sep 28, 2026
15	Cmta, INC	Indirect evidence	Louisville, KY, United StatesHQ checked Sep 28, 2026	501-1,000	936 contacts →
	Indirect evidence “CMTA is part of Legence, a Nasdaq Listed company.” Source: RevenueBase Database · checked Sep 28, 2026
16	Stellar	Partial evidence	Jacksonville, FL, United StatesHQ checked Sep 28, 2026	501-1,000	899 contacts →
	Partial 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 28, 2026
17	Prime Controls	Indirect evidence	Lewisville, TX, United StatesHQ checked Sep 28, 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 28, 2026
18	AHERN	Partial evidence	Fond Du Lac, WI, United StatesHQ checked Sep 28, 2026	1,001-5,000	849 contacts →
	Partial evidence “Ahern is a mechanical and fire protection contractor specializing in HVAC, Plumbing, Building Controls, Sprinkler, Extinguisher & Alarm and Fabrication for construction and…” Source: RevenueBase Database · checked Sep 28, 2026
19	Kinetics	Strong evidence	Livermore, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	734 contacts →
	Strong evidence “Founded in 1973, Kinetics is a full-service process and mechanical contractor specializing in the design and installation of process, mechanical, plumbing and HVAC systems.” Source: RevenueBase Database · checked Sep 28, 2026
20	Apollo Mechanical Contractors	Partial evidence	Kennewick, WA, United StatesHQ checked Sep 28, 2026	1,001-5,000	682 contacts →
	Partial evidence “Apollo is based in Kennewick, Washington, performing Full Mechanical projects across the United States and around the world.” Source: RevenueBase Database · checked Sep 28, 2026
21	Ghafari Associates	Partial evidence	Dearborn, MI, United StatesHQ checked Sep 28, 2026	501-1,000	670 contacts →
	Partial evidence “An innovator since 1982, Ghafari embraces an integrated design approach to deliver solutions that synergize building operations, systems, and people.” Source: RevenueBase Database · checked Sep 28, 2026
22	Baker Group	Indirect evidence	Ankeny, IA, United StatesHQ checked Sep 28, 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 28, 2026
23	Setpoint Integrated Solutions, INC	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 28, 2026	501-1,000	626 contacts →
	Indirect evidence “Setpoint Integrated Solutions, a Vytl Company is a leading integrated solutions and services provider in the process control industry.” Source: RevenueBase Database · checked Sep 28, 2026
24	Wunderlich-Malec Engineering, INC	Partial evidence	Eden Prairie, MN, United StatesHQ checked Sep 28, 2026	501-1,000	623 contacts →
	Partial evidence “Wunderlich-Malec Engineering is a nationally recognized, 100% employee-owned leader in advanced engineering and control system solutions.” Source: RevenueBase Database · checked Sep 28, 2026
25	E Tech Group	Partial evidence	West Chester, OH, United StatesHQ checked Sep 28, 2026	501-1,000	610 contacts →
	Partial evidence “E Tech Group is one of the largest engineering and system integration firms in the United States.” Source: RevenueBase Database · checked Sep 28, 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: mechanical systems integrators. 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 mechanical systems integrators.
Partial evidence: Its own public description names part of mechanical systems integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mechanical systems integrators. 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 5,940 mechanical systems integrators based in the United States

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Mechanical systems integrators based in the United States at a glance

As of Sep 28, 2026

42.4%Verified-email coverage

28.8Average contacts per company

11-50Median size (employees)

1.9%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,879

11-50

2,274

51-200

1,287

201-500

325

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 5,940 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 mechanical systems integrators, 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 “mechanical systems integrators”. 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 mechanical systems integrators), 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 mechanical systems integrators, 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, 72,444 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 28, 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.

Mechanical systems integrators 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 mechanical systems integrators, 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 mechanical systems integrators are there based in the United States?

RevenueBase identified 5,940 mechanical systems integrators 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 mechanical systems integrators?

Houston leads with 113 headquartered companies, followed by New York (61) and Indianapolis (44).

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 72,444 verified decision-maker contacts tracked across these 5,940 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 28, 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.