Company lists · Data refreshed September 2026

Top 25 Building systems maintenance contractors based in the United States

Name: Building systems maintenance contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 6,258 companies tracked

RevenueBase identified 6,258 building systems maintenance contractors headquartered in the United States as of September 2026 and tracks 121,833 professional contacts across them, including 39,873 with verified work emails. Houston is the largest hub.

This list covers building systems maintenance contractors 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 16, 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 16, 2026 86% judged on-target in blind review

6,258Companies

121,833Contacts tracked

39,873Verified emails

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The 25 largest building systems maintenance contractors based in the United States

Ranked by team size

Top 25 of 6,258 building systems maintenance contractors based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to building systems maintenance contractors: 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	Acco Engineered Systems	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 16, 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 16, 2026
2	GCA Services Group	Indirect evidence	NY, United StatesHQ checked Sep 16, 2026	10001+	2,295 contacts →
	Indirect evidence “ABM (NYSE: ABM) is a Fortune 500 company and leading provider of facility solutions with offices throughout the United States and various international locations.” Source: RevenueBase Database · checked Sep 16, 2026
3	Tdindustries, INC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,909 contacts →
	Indirect evidence “TDIndustries delivers a comprehensive approach to Facility Services and Mechanical Construction.” Source: RevenueBase Database · checked Sep 16, 2026
4	Emcor Group, INC	Indirect evidence	Norwalk, CT, United StatesHQ checked Sep 16, 2026	10001+	1,383 contacts →
	Indirect 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 16, 2026
5	Comfort Systems USA	Partial evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	10001+	1,330 contacts →
	Partial evidence “Comfort Systems USA \| Quality People.” Source: RevenueBase Database · checked Sep 16, 2026
6	City Wide Facility Solutions	Strong evidence	Lenexa, KS, United StatesHQ checked Sep 16, 2026	n/a	1,192 contacts →
	Strong evidence “Founded in 1961, City Wide has become synonymous with building maintenance in its home Kansas City market and now has over 100 franchise locations in the United States and Canada.” Source: RevenueBase Database · checked Sep 16, 2026
7	Mckenney's, INC	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,077 contacts →
	Partial evidence “McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.” Source: RevenueBase Database · checked Sep 16, 2026
8	Flagship Facility Services, INC	Partial evidence	San Jose, CA, United StatesHQ checked Sep 16, 2026	5,001-10,000	1,056 contacts →
	Partial evidence “Flagship Facility Services is a facilities maintenance company headquartered in Southlake, Texas.” Source: RevenueBase Database · checked Sep 16, 2026
9	LEE Company	Indirect evidence	Franklin, TN, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,019 contacts →
	Indirect evidence “Since 1944, we’ve been family-owned and family-focused, built on values that last and a mission that matters.” Source: RevenueBase Database · checked Sep 16, 2026
10	GSH Group	Partial evidence	Parsippany, NJ, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,017 contacts →
	Partial evidence “GSH Group is a premier provider of global integrated facilities management and building engineering services.” Source: RevenueBase Database · checked Sep 16, 2026
11	Cmta, INC	Indirect evidence	Louisville, KY, United StatesHQ checked Sep 16, 2026	501-1,000	936 contacts →
	Indirect evidence “CMTA is part of Legence, a Nasdaq Listed company.” Source: RevenueBase Database · checked Sep 16, 2026
12	Marsden Services	Indirect evidence	St. Paul, MN, United StatesHQ checked Sep 16, 2026	5,001-10,000	791 contacts →
	Indirect evidence “Established in 1952 by Skip Marsden, Marsden Services is one of the largest privately-held facility services organizations in the United States.” Source: RevenueBase Database · checked Sep 16, 2026
13	Limbach	Partial evidence	Tampa, FL, United StatesHQ checked Sep 16, 2026	1,001-5,000	745 contacts →
	Partial evidence “Limbach is a leading building solutions firm delivering mission critical infrastructure that supports life’s most important moments.” Source: RevenueBase Database · checked Sep 16, 2026
14	Archkey Solutions	Partial evidence	St. Louis, MO, United StatesHQ checked Sep 16, 2026	1,001-5,000	744 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 16, 2026
15	Vixxo Facility Solutions	Indirect evidence	Scottsdale, AZ, United StatesHQ checked Sep 16, 2026	501-1,000	679 contacts →
	Indirect evidence “At Vixxo Facility Solutions, we pride ourselves on delivering unparalleled expertise to create outstanding customer experiences.” Source: RevenueBase Database · checked Sep 16, 2026
16	Baker Group	Partial evidence	Ankeny, IA, United StatesHQ checked Sep 16, 2026	1,001-5,000	655 contacts →
	Partial 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 16, 2026
17	Davaco	Partial evidence	Irving, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	642 contacts →
	Partial evidence “Welcome to DAVACO – Elevating brand experiences through top-tier facilities maintenance and project management solutions.#DAVACO #BrandExperience As a leading turn-key solution…” Source: RevenueBase Database · checked Sep 16, 2026
18	IH Services, INC	Indirect evidence	Sebastian, FL, United StatesHQ checked Sep 16, 2026	1,001-5,000	642 contacts →
	Indirect evidence “Where Facility Excellence Meets Defense Standards Ready • Secure • Lean We serve operators who cannot afford a facility failure: defense primes, secure federal installations…” Source: RevenueBase Database · checked Sep 16, 2026
19	Pritchard Industries	Partial evidence	New York, NY, United StatesHQ checked Sep 16, 2026	10001+	637 contacts →
	Partial evidence “Driven by a singular vision, it is our mission to provide unparalleled excellence in building services with an emphasis on quality, integrity & innovation.” Source: RevenueBase Database · checked Sep 16, 2026
20	Facilities Maintenance Management, Llc. FMM	Partial evidence	Denham Springs, LA, United StatesHQ checked Sep 16, 2026	n/a	604 contacts →
	Partial evidence “Facilities Maintenance Management is a company comprised of a team of professionals dedicated to uncompromising quality, responsive service, value and integrity.” Source: RevenueBase Database · checked Sep 16, 2026
21	F.E. Moran Group Of Companies	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 16, 2026	1,001-5,000	564 contacts →
	Indirect evidence “At F.E.” Source: RevenueBase Database · checked Sep 16, 2026
22	Deem, LLC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 16, 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 16, 2026
23	Horizon Services, LLC	Indirect evidence	Wilmington, DE, United StatesHQ checked Sep 16, 2026	501-1,000	448 contacts →
	Indirect evidence “Horizon Services is the premier heating, air conditioning, plumbing, drain cleaning and sewer services company in Delaware (New Castle County & Kent County), Pennsylvania…” Source: RevenueBase Database · checked Sep 16, 2026
24	The Miner Corporation	Indirect evidence	Grapevine, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	443 contacts →
	Indirect evidence “Miner is the nationally recognized leader in emergency repair service for docks, doors, glass and more.” Source: RevenueBase Database · checked Sep 16, 2026
25	Pacific RIM Mechanical	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 16, 2026	501-1,000	441 contacts →
	Indirect evidence “At Pacific Rim Mechanical, we deliver comprehensive mechanical contracting and facility services across Southern California.” Source: RevenueBase Database · checked Sep 16, 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 maintenance contractors. 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 maintenance contractors.
Partial evidence: Its own public description names part of building systems maintenance contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name building systems maintenance contractors. 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 6,258 building systems maintenance contractors based in the United States

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Building systems maintenance contractors based in the United States at a glance

As of Sep 16, 2026

32.7%Verified-email coverage

19.5Average contacts per company

11-50Median size (employees)

1.6%Largest-city concentration · Houston

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

2,346

11-50

2,309

51-200

1,096

201-500

258

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 6,258 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 maintenance contractors, 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 maintenance contractors”. 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 maintenance contractors), 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 maintenance contractors, 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, 39,873 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 16, 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 maintenance contractors 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 maintenance contractors, 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 maintenance contractors are there based in the United States?

RevenueBase identified 6,258 building systems maintenance contractors 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?

Acco Engineered Systems, headquartered in Pasadena, tops this list with the largest team on record.

Which city has the most building systems maintenance contractors?

Houston leads with 100 headquartered companies, followed by New York (92) and Indianapolis (49).

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 39,873 verified decision-maker contacts tracked across these 6,258 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 16, 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.