Company lists · Data refreshed September 2026

Top 25 Mep engineering firms based in Houston, United States

Name: Mep engineering firms based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 100 companies tracked

RevenueBase identified 100 mep engineering firms headquartered in Houston, United States as of September 2026 and tracks 3,965 professional contacts across them, including 1,849 with verified work emails. New York is the largest hub.

This list covers mep engineering firms headquartered in Houston, 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 17, 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 17, 2026 86% judged on-target in blind review

100Companies

3,965Contacts tracked

1,849Verified emails

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The 25 largest mep engineering firms based in Houston, United States

Ranked by team size

Top 25 of 100 mep engineering firms based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to mep engineering firms: 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	Comfort Systems USA	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	10001+	1,330 contacts →
	Indirect evidence “Comfort Systems USA \| Quality People.” Source: RevenueBase Database · checked Sep 17, 2026
2	Quanta Infrastructure Solutions Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	538 contacts →
	Indirect evidence “Quanta Infrastructure Solutions Group (QISG) is a recognized leader in EPC, design-build, and CMAR services for electrical infrastructure, wastewater and specialty projects…” Source: RevenueBase Database · checked Sep 17, 2026
3	Kilgore Industries, LP	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	255 contacts →
	Indirect evidence “Kilgore Industries, LP offers turnkey mechanical contracting services including electrical and plumbing construction solutions.” Source: RevenueBase Database · checked Sep 17, 2026
4	DBR	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	227 contacts →
	Strong evidence “Founded in 1972, DBR has evolved into the premier MEP engineering firm in Texas, providing mechanical, electrical, and plumbing engineering services, as well as building…” Source: RevenueBase Database · checked Sep 17, 2026
5	Shah Smith & Associates, INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	134 contacts →
	Strong evidence “Shah Smith & Associates, Inc.(SSA) is a 120+ employee Mechanical, Electrical, and Plumbing (MEP) consulting engineering firm with offices in Houston, Austin & Dallas.” Source: RevenueBase Database · checked Sep 17, 2026
6	Letsos Company	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	115 contacts →
	Indirect evidence “In 1953, James N.” Source: RevenueBase Database · checked Sep 17, 2026
7	Gray Mechanical Contractors, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	88 contacts →
	Indirect evidence “Gray Mechanical Contractors is a licensed HVAC and Plumbing contractor providing construction services for General Contractors and building owners throughout Texas.” Source: RevenueBase Database · checked Sep 17, 2026
8	Raven Mechanical, LP	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	72 contacts →
	Indirect evidence “Raven Mechanical, founded 1979, is a full service mechanical contractor specializing in Plumbing and HVAC service and construction.” Source: RevenueBase Database · checked Sep 17, 2026
9	Humphrey Company, LTD	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	69 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
10	Wylie Engineering	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	66 contacts →
	Strong evidence “Wylie was established in 1988 and has grown steadily to become a leading MEP engineering firm in Texas with offices in Houston and Austin.” Source: RevenueBase Database · checked Sep 17, 2026
11	Decon LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	55 contacts →
	Partial evidence “MBE \| SBE \| DBE \| HUB \| HHF, TBPE Firm No 16156 DECON LLC,founded by Fulvio Jaramillo, a consulting engineering firm committed to technical excellence, DECON’s services help…” Source: RevenueBase Database · checked Sep 17, 2026
12	MEP Green Design & Build, Pllc	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	53 contacts →
	Strong evidence “MEP Green Design & Build, PLLC,(MEPG) is a full-service engineering firm made up of a dedicated team of professionals offering expertise in Mechanical, Electrical, Plumbing and…” Source: RevenueBase Database · checked Sep 17, 2026
13	Har-Con Mechanical	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	50 contacts →
	Indirect evidence “Founded in 1955, HAR-CON is a full service mechanical contractor well versed in Plumbing and HVAC.” Source: RevenueBase Database · checked Sep 17, 2026
14	I. A. Naman Associates, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	46 contacts →
	Indirect evidence “Since 1947, I.” Source: RevenueBase Database · checked Sep 17, 2026
15	RPT Alliance LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	43 contacts →
	Indirect evidence “As of December 8, 2025, RTP Alliance has been acquired by by Bowman.” Source: RevenueBase Database · checked Sep 17, 2026
16	Johnston	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	40 contacts →
	Strong evidence “Founded in 2001, Johnston is a multi-talented firm based in Houston, Texas that provides architecture, MEP engineering and planning professional design services that span all…” Source: RevenueBase Database · checked Sep 17, 2026
17	Collaborative Engineering Group	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	26 contacts →
	Partial evidence “At Collaborative Engineering Group, we believe the best solutions come from working together.” Source: RevenueBase Database · checked Sep 17, 2026
18	E&c Engineers	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	26 contacts →
	Indirect evidence “E&C Engineers & Consultants Inc.” Source: RevenueBase Database · checked Sep 17, 2026
19	Direct Service, Construction & Design	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	22 contacts →
	Partial evidence “Direct Service, Construction & Design provides turnkey mechanical (HVAC), electrical, plumbing (MEP) and general building solutions by way of service, construction and design.” Source: RevenueBase Database · checked Sep 17, 2026
20	CFI Companies, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	21 contacts →
	Partial evidence “Established in 2012, CFI Companies is a consulting engineering firm that provides mechanical, electrical, plumbing and low voltage engineering design services as well as…” Source: RevenueBase Database · checked Sep 17, 2026
21	N&a Engineering Solutions, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	19 contacts →
	Partial evidence “N&A USA Engineering Solutions, Inc was founded in 2015 and is a specialized in multidisciplinary engineering & project management for medium & large-sized projects, working across…” Source: RevenueBase Database · checked Sep 17, 2026
22	LEE Truong & YU Engineers, Pllc LTY Engineers	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	18 contacts →
	Partial evidence “Lee Truong & Yu Engineers, PLLC, is a full-service Mechanical, Electrical and Plumbing engineering consulting firm with offices in Dallas and Houston.” Source: RevenueBase Database · checked Sep 17, 2026
23	Gregory-Edwards, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	18 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
24	Leaf Engineers	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	17 contacts →
	Partial evidence “LEAF Engineers provides comprehensive mechanical, electrical and plumbing/fire protection engineering design services along with technology, AV and security consulting services to…” Source: RevenueBase Database · checked Sep 17, 2026
25	ESM Engineers	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	17 contacts →
	Partial evidence “At ESM Engineers, we're artisans in engineering, transforming client visions into plans that exceed standards and codes.” Source: RevenueBase Database · checked Sep 17, 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: mep engineering firms. 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 mep engineering firms.
Partial evidence: Its own public description names part of mep engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mep engineering firms. 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 100 mep engineering firms based in Houston, United States

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Mep engineering firms based in Houston, United States at a glance

As of Sep 17, 2026

46.6%Verified-email coverage

39.6Average contacts per company

11-50Median size (employees)

131.0%Largest-city concentration · New York

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

10001+

Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 100 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 mep engineering firms, 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 Houston, United States whose own description of what they do matches “mep engineering firms”. 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 mep engineering firms), 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 mep engineering firms, and records with no verified work email. Companies headquartered outside Houston 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, 1,849 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 17, 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.

Mep engineering firms by metro in the United States

Mep engineering firms in New York131
Mep engineering firms in Houston100
Mep engineering firms in Austin51
Mep engineering firms in Miami50
Mep engineering firms in Chicago42
Mep engineering firms in Dallas39
Mep engineering firms in Phoenix36
Mep engineering firms in San Diego36
Mep engineering firms in Charlotte35
Mep engineering firms in Orlando33
Mep engineering firms in Tampa33
Mep engineering firms in Indianapolis32
Mep engineering firms in Atlanta29
Mep engineering firms in San Antonio28
Mep engineering firms in San Francisco27
Mep engineering firms in Las Vegas26
Mep engineering firms in Los Angeles25

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 mep engineering firms, 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 mep engineering firms are there based in Houston, United States?

RevenueBase identified 100 mep engineering firms headquartered in Houston, 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?

Comfort Systems USA, headquartered in Houston, tops this list with the largest team on record.

Which city has the most mep engineering firms?

New York leads with 131 headquartered companies, followed by Houston (100) and Austin (51).

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 1,849 verified decision-maker contacts tracked across these 100 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 17, 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.