Company lists · Data refreshed September 2026

Top 25 Retrofit contractors based in the United States

Name: Retrofit 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 17, 2026 5,218 companies tracked

RevenueBase identified 5,218 company matches for retrofit contractors associated with the United States as of September 2026 and tracks 65,388 professional contacts across them, including 23,994 with verified work emails. New York is the largest hub.

This list covers company matches for retrofit contractors associated with the 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

5,218Companies

65,388Contacts tracked

23,994Verified emails

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The 25 largest retrofit contractors based in the United States

Ranked by team size

Top 25 of 5,218 company matches for retrofit contractors based in the 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	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Sep 17, 2026	1,001-5,000	2,213 contacts →
	Exact match “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
2	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,383 contacts →
	Exact match “Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
3	Climatec, LLC	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 17, 2026	1,001-5,000	863 contacts →
	Exact match “Climatec has been making buildings safer, more comfortable and efficient for over 40 years.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
4	SEL Construction Corporation	Exact match	Loomis, CA, United StatesHQ recorded Sep 17, 2026	n/a	722 contacts →
	Exact match “Experienced commercial contractor specializing in renewable energy, electrical, and roofing projects for privately-owned buildings as well as state/local government buildings in…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
5	Baker Group	Exact match	Ankeny, IA, United StatesHQ recorded Sep 17, 2026	1,001-5,000	655 contacts →
	Exact match “Established in 1963, Baker Group is Iowa’s premier full-service specialty contractor-serving commercial, industrial, institutional, and mission-critical markets across the country.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
6	Alterman, INC	Exact match	Live Oak, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	597 contacts →
	Exact match “Since 1923, Alterman has provided electrical construction on many of San Antonio and Austin's most impressive landmarks and contemporary structures.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
7	Murphy Company	Exact match	St. Louis, MO, United StatesHQ recorded Sep 17, 2026	1,001-5,000	579 contacts →
	Exact match “Per Colorado State Law Our CO Plumbing Contractor License Our Master Plumbing License is MP.03001288.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
8	Pieper Electric, INC	Exact match	New Berlin, WI, United StatesHQ recorded Sep 17, 2026	501-1,000	498 contacts →
	Exact match “At Pieper Electric, Inc,"Our People Are Our Power" isn't just a phrase; it's our way of life.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
9	Noresco	Exact match	Westborough, MA, United StatesHQ recorded Sep 17, 2026	201-500	481 contacts →
	Exact match “NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
10	Carlisle Companies Incorporated	Exact match	Scottsdale, AZ, United StatesHQ recorded Sep 17, 2026	5,001-10,000	472 contacts →
	Exact match “Carlisle Companies Incorporated is a leading supplier of innovative building envelope products and solutions for more energy efficient buildings.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
11	Sitelogiq	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 17, 2026	501-1,000	450 contacts →
	Exact match “SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
12	Jmeg Electrical Contractors	Exact match	Farmers Branch, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	437 contacts →
	Exact match “JMEG is a team of professionals who have been providing electrical construction services for over 35 years throughout the state of Texas.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
13	Romanoff Group	Exact match	Gahanna, OH, United StatesHQ recorded Sep 17, 2026	1,001-5,000	431 contacts →
	Exact match “The Romanoff Group of Companies has been dedicated to providing specialized electrical, plumbing, and heating and cooling services since 1992.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
14	John W. Danforth Company	Exact match	Tonawanda, NY, United StatesHQ recorded Sep 17, 2026	501-1,000	415 contacts →
	Exact match “We are powered by the best people in the industry.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
15	Strada Services	Exact match	Sanford, FL, United StatesHQ recorded Sep 17, 2026	1,001-5,000	391 contacts →
	Exact match “Strada Services is a full service electrical, security, and air conditioning contracting company servicing residential, commercial, and industrial customers in Florida and in the…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
16	Veregy	Exact match	Phoenix, MO, United StatesHQ recorded Sep 17, 2026	501-1,000	383 contacts →
	Exact match “Veregy is an award-winning NAESCO-Accredited decarbonization company focusing on accelerating and simplifying the Energy Transition.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
17	Homeworks Energy, INC	Exact match	Medford, MA, United StatesHQ recorded Sep 17, 2026	201-500	356 contacts →
	Exact match “At HomeWorks Energy, our mission is simple, literally: Energy Efficiency, Simplified.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
18	United Mechanical	Exact match	San Jose, CA, United StatesHQ recorded Sep 17, 2026	201-500	346 contacts →
	Exact match “United Mechanical specializes in HVAC and Plumbing systems design, construction, retrofit, repair, and 24/7 emergency service for commercial and industrial properties throughout…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
19	Sunbelt Controls	Exact match	Pleasanton, CA, United StatesHQ recorded Sep 17, 2026	201-500	322 contacts →
	Exact match “Sunbelt Controls is a leading full-service building automation contractor for new construction and retrofit projects in the Western United States.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
20	Villara Building Systems	Exact match	Mcclellan Park, CA, United StatesHQ recorded Sep 17, 2026	1,001-5,000	303 contacts →
	Exact match “Villara is one of the nation’s largest mechanical contractors.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
21	John E. Green Company	Exact match	Highland Park, MI, United StatesHQ recorded Sep 17, 2026	1,001-5,000	301 contacts →
	Exact match “In 1909, John E.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
22	Kimbel Mechanical Systems INC	Exact match	Fayetteville, AR, United StatesHQ recorded Sep 17, 2026	501-1,000	297 contacts →
	Exact match “Kimbel Mechanical Systems, Inc.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
23	The Hill Group	Exact match	Franklin Park, IL, United StatesHQ recorded Sep 17, 2026	501-1,000	285 contacts →
	Exact match “The Hill Group is a Chicago-based mechanical contractor specializing in HVAC, plumbing, fire protection, testing/balancing, and commissioning.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
24	Batchelor & Kimball, INC	Exact match	Conyers, GA, United StatesHQ recorded Sep 17, 2026	1,001-5,000	270 contacts →
	Exact match “Batchelor & Kimball is a mechanical engineering and plumbing contractor specializing in projects that call for advanced expertise and problem-solving.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
25	GEM Incorporated	Exact match	Walbridge, OH, United StatesHQ recorded Sep 17, 2026	1,001-5,000	270 contacts →
	Exact match “Contractor for Life At GEM Inc, we’re experienced problem solvers with the insight, integrity and resources to see you through your toughest challenges.” 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 “retrofit contractors”. 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 5,218 retrofit contractors based in the United States

See the full list, filter by size, metro and specialty, and access 23,994 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Retrofit contractors based in the United States at a glance

As of Sep 17, 2026

36.7%Verified-email coverage

12.5Average contacts per company

11-50Median size (employees)

2.5%Largest-city concentration · New York

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

2,352

11-50

1,989

51-200

660

201-500

125

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 5,218 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 the United States whose business descriptions match “retrofit contractors” 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 23,994 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.

Retrofit contractors by metro

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 “retrofit contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many retrofit contractors are there based in the United States?

RevenueBase identified 5,218 company matches for retrofit contractors associated with the 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?

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

Which city has the most retrofit contractors?

New York leads with 131 company records, followed by Houston (72) and Los Angeles (72).

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 23,994 professional contacts with verified work emails tracked across these 5,218 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.

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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 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.