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 company matches for mep engineering firms associated with Houston, United States as of September 2026 and tracks 3,965 professional contacts across them, including 1,849 with verified work emails. Across the United States, New York is the largest hub for this category (131 companies); Houston follows with 100.

This list covers company matches for mep engineering firms associated with Houston, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 17, 2026 How this list was built

100Companies

3,965Contacts tracked

1,849Verified emails

Explore this list → Free signup · no credit card · 500 free credits

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

Ranked by team size

Top 25 of 100 company matches for mep engineering firms based in Houston, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 17, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Comfort Systems USA	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	10001+	1,330 contacts →
	Exact match “Comfort Systems USA \| Quality People.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
2	Quanta Infrastructure Solutions Group	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	538 contacts →
	Exact match “Quanta Infrastructure Solutions Group (QISG) is a recognized leader in EPC, design-build, and CMAR services for electrical infrastructure, wastewater and specialty projects…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
3	Kilgore Industries, LP	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	255 contacts →
	Exact match “Kilgore Industries, LP offers turnkey mechanical contracting services including electrical and plumbing construction solutions.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
4	DBR	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	201-500	227 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
5	Shah Smith & Associates, INC	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	51-200	134 contacts →
	Exact match “Shah Smith & Associates, Inc.(SSA) is a 120+ employee Mechanical, Electrical, and Plumbing (MEP) consulting engineering firm with offices in Houston, Austin & Dallas.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
6	Letsos Company	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	201-500	115 contacts →
	Exact match “In 1953, James N.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
7	Gray Mechanical Contractors, LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	51-200	88 contacts →
	Exact match “Gray Mechanical Contractors is a licensed HVAC and Plumbing contractor providing construction services for General Contractors and building owners throughout Texas.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
8	Raven Mechanical, LP	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	51-200	72 contacts →
	Exact match “Raven Mechanical, founded 1979, is a full service mechanical contractor specializing in Plumbing and HVAC service and construction.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
9	Humphrey Company, LTD	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	69 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
10	Wylie Engineering	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	51-200	66 contacts →
	Exact match “Wylie was established in 1988 and has grown steadily to become a leading MEP engineering firm in Texas with offices in Houston and Austin.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
11	Decon LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	11-50	55 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
12	MEP Green Design & Build, Pllc	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	51-200	53 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
13	Har-Con Mechanical	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	51-200	50 contacts →
	Exact match “Founded in 1955, HAR-CON is a full service mechanical contractor well versed in Plumbing and HVAC.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
14	I. A. Naman Associates, INC	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	11-50	46 contacts →
	Exact match “Since 1947, I.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
15	RPT Alliance LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	11-50	43 contacts →
	Exact match “As of December 8, 2025, RTP Alliance has been acquired by by Bowman.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
16	Johnston	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	11-50	40 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
17	Collaborative Engineering Group	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	11-50	26 contacts →
	Exact match “At Collaborative Engineering Group, we believe the best solutions come from working together.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
18	E&c Engineers	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	11-50	26 contacts →
	Exact match “E&C Engineers & Consultants Inc.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
19	Direct Service, Construction & Design	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	51-200	22 contacts →
	Exact match “Direct Service, Construction & Design provides turnkey mechanical (HVAC), electrical, plumbing (MEP) and general building solutions by way of service, construction and design.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
20	CFI Companies, INC	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	11-50	21 contacts →
	Exact match “Established in 2012, CFI Companies is a consulting engineering firm that provides mechanical, electrical, plumbing and low voltage engineering design services as well as…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
21	N&a Engineering Solutions, INC	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	201-500	19 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
22	LEE Truong & YU Engineers, Pllc LTY Engineers	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	11-50	18 contacts →
	Exact match “Lee Truong & Yu Engineers, PLLC, is a full-service Mechanical, Electrical and Plumbing engineering consulting firm with offices in Dallas and Houston.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
23	Gregory-Edwards, INC	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	11-50	18 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
24	Leaf Engineers	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	51-200	17 contacts →
	Exact match “LEAF Engineers provides comprehensive mechanical, electrical and plumbing/fire protection engineering design services along with technology, AV and security consulting services to…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
25	ESM Engineers	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	1-10	17 contacts →
	Exact match “At ESM Engineers, we're artisans in engineering, transforming client visions into plans that exceed standards and codes.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “mep engineering firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 100 mep engineering firms based in Houston, United States

See the full list, filter by size, metro and specialty, and access 1,849 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

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)

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

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Houston, United States whose business descriptions match “mep engineering firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 1,849 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Mep engineering firms by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “mep engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 100 company matches for mep engineering firms associated with Houston, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Comfort Systems USA tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most mep engineering firms?

New York leads the United States with 131 company records, 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 limited free results with 500 credits to start. Upgrading provides access to the 1,849 professional contacts with verified work emails tracked across these 100 companies; direct dials are available where recorded.

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.

Ready to reach these companies? Verified emails and direct dials for all 100 mep engineering firms based in Houston, United States. Start with a free account, no credit card.

Download this list →

Related lists

Mep engineering firms by geography

Browse the directory

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 SmartSearch, 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.