Company lists · Data refreshed September 2026

Top 25 Ac companies based in the United States

Name: Ac 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 21, 2026 10,545 companies tracked

RevenueBase identified 10,545 ac companies headquartered in the United States as of September 2026 and tracks 116,804 professional contacts across them, including 38,259 with verified work emails. Houston is the largest hub.

This list covers ac 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 21, 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 21, 2026 86% judged on-target in blind review

10,545Companies

116,804Contacts tracked

38,259Verified emails

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The 25 largest ac companies based in the United States

Ranked by team size

Top 25 of 10,545 ac companies based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to ac 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	Daikin Applied Americas	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 21, 2026	10001+	4,204 contacts →
	Indirect evidence “Daikin Applied delivers superior air quality and energy efficiency to every solution with innovation in advanced technology, IoT, and next generation compressors.” Source: RevenueBase Database · checked Sep 21, 2026
2	Acco Engineered Systems	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,415 contacts →
	Indirect 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 21, 2026
3	Goodman AIR Conditioning & Heating	Indirect evidence	Waller, TX, United StatesHQ checked Sep 21, 2026	10001+	2,375 contacts →
	Indirect evidence “Since 1982, Goodman Manufacturing has had one goal: provide customers with reliable, high-quality, energy-efficient, and affordable indoor comfort products.” Source: RevenueBase Database · checked Sep 21, 2026
4	Aaon, INC	Indirect evidence	Tulsa, OK, United StatesHQ checked Sep 21, 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 21, 2026
5	Mckenney's, INC	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 21, 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 21, 2026
6	Greenheck	Indirect evidence	Schofield, WI, United StatesHQ checked Sep 21, 2026	1,001-5,000	975 contacts →
	Indirect evidence “Greenheck is the global leader in engineering and manufacturing air movement, conditioning, and control equipment for nonresidential buildings.” Source: RevenueBase Database · checked Sep 21, 2026
7	Cmta, INC	Indirect evidence	Louisville, KY, United StatesHQ checked Sep 21, 2026	501-1,000	936 contacts →
	Indirect evidence “CMTA is part of Legence, a Nasdaq Listed company.” Source: RevenueBase Database · checked Sep 21, 2026
8	Baltimore Aircoil Company	Indirect evidence	Jessup, MD, United StatesHQ checked Sep 21, 2026	1,001-5,000	906 contacts →
	Indirect evidence “At BAC, we don’t just build cooling systems, we shape the future of sustainable solutions.” Source: RevenueBase Database · checked Sep 21, 2026
9	Greenheck Group	Indirect evidence	Schofield, WI, United StatesHQ checked Sep 21, 2026	5,001-10,000	783 contacts →
	Indirect evidence “Greenheck Group is made up of team members who serve as leaders in air movement, control, and conditioning equipment, providing solutions across a range of applications and…” Source: RevenueBase Database · checked Sep 21, 2026
10	Coolsys	Indirect evidence	Brea, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	750 contacts →
	Indirect evidence “CoolSys solves the most complex challenges in refrigeration, air conditioning, heating, engineering, and energy management.” Source: RevenueBase Database · checked Sep 21, 2026
11	F.E. Moran Group Of Companies	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	564 contacts →
	Indirect evidence “At F.E.” Source: RevenueBase Database · checked Sep 21, 2026
12	Climate Pros, LLC	Indirect evidence	Glendale Heights, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	554 contacts →
	Indirect evidence “At Climate Pros, LLC, we are a leading commercial refrigeration and HVAC company specializing in the design, construction, and servicing of refrigeration systems across thousands…” Source: RevenueBase Database · checked Sep 21, 2026
13	Deem, LLC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 21, 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 21, 2026
14	Texas Airsystems	Indirect evidence	Irving, TX, United StatesHQ checked Sep 21, 2026	201-500	523 contacts →
	Indirect evidence “In business for over 45 years, Texas AirSystems has grown to be recognized as one of the premier partners for commercial HVAC solutions in Texas, boasting over 500 associates…” Source: RevenueBase Database · checked Sep 21, 2026
15	Long Building Technologies	Indirect evidence	Littleton, CO, United StatesHQ checked Sep 21, 2026	501-1,000	453 contacts →
	Indirect evidence “Since 1965, LONG has been in the business of building performance; making them automated, efficient, green, and safe.” Source: RevenueBase Database · checked Sep 21, 2026
16	Hoffman & Hoffman, INC	Indirect evidence	Greensboro, NC, United StatesHQ checked Sep 21, 2026	1,001-5,000	445 contacts →
	Indirect evidence “Since 1947, Hoffman & Hoffman, Inc.” Source: RevenueBase Database · checked Sep 21, 2026
17	AIR Distribution Technologies, INC	Indirect evidence	Plano, TX, United StatesHQ checked Sep 21, 2026	1,001-5,000	424 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
18	Source Refrigeration & Hvac	Indirect evidence	Brea, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	420 contacts →
	Indirect evidence “For up-to-date information, please see the CoolSys profile page.” Source: RevenueBase Database · checked Sep 21, 2026
19	John W. Danforth Company	Indirect evidence	Tonawanda, NY, United StatesHQ checked Sep 21, 2026	501-1,000	415 contacts →
	Indirect evidence “We are powered by the best people in the industry.” Source: RevenueBase Database · checked Sep 21, 2026
20	Aire Serv Heating And AIR Conditioning	Indirect evidence	Waco, TX, United StatesHQ checked Sep 21, 2026	201-500	369 contacts →
	Indirect evidence “For consumer services visit To discover more about franchise opportunities with Aire Serv® in your area visit Established in 1992, Aire Serv® is a global franchise organization…” Source: RevenueBase Database · checked Sep 21, 2026
21	AIR Systems, INC	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 21, 2026	201-500	348 contacts →
	Indirect evidence “Whether building quality work environments, valuable relationships or community ties, Air Systems never cuts corners.” Source: RevenueBase Database · checked Sep 21, 2026
22	United Mechanical	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 21, 2026	201-500	346 contacts →
	Indirect evidence “United Mechanical specializes in HVAC and Plumbing systems design, construction, retrofit, repair, and 24/7 emergency service for commercial and industrial properties throughout…” Source: RevenueBase Database · checked Sep 21, 2026
23	Brady Services	Indirect evidence	Greensboro, NC, United StatesHQ checked Sep 21, 2026	501-1,000	340 contacts →
	Indirect evidence “Since 1962, Brady has been committed to delivering innovative, sustainable building solutions that drive long-term success for our customers.” Source: RevenueBase Database · checked Sep 21, 2026
24	Havtech	Indirect evidence	Columbia, MD, United StatesHQ checked Sep 21, 2026	201-500	333 contacts →
	Indirect evidence “Havtech delivers innovative commercial and industrial HVAC solutions across Maryland, Washington, D.C, Virginia, Pennsylvania, and West Virginia.” Source: RevenueBase Database · checked Sep 21, 2026
25	Boland	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 21, 2026	201-500	323 contacts →
	Indirect evidence “Boland is the leading commercial HVAC systems, services, and building energy solutions provider in the DC metro area.” Source: RevenueBase Database · checked Sep 21, 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: ac 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 ac companies.
Partial evidence: Its own public description names part of ac companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ac 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 10,545 ac companies based in the United States

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Ac companies based in the United States at a glance

As of Sep 21, 2026

32.8%Verified-email coverage

11.1Average contacts per company

11-50Median size (employees)

1.5%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

4,906

11-50

4,179

51-200

1,072

201-500

170

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 10,545 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 ac 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 “ac 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 ac 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 ac 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, 38,259 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 21, 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.

Ac 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 ac 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 ac companies are there based in the United States?

RevenueBase identified 10,545 ac 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?

Daikin Applied Americas, headquartered in Minneapolis, tops this list with the largest team on record.

Which city has the most ac companies?

Houston leads with 156 headquartered companies, followed by New York (102) and San Antonio (88).

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 38,259 verified decision-maker contacts tracked across these 10,545 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 21, 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.