Company lists · Data refreshed September 2026

Top 25 Weatherization contractors based in the United States

Name: Weatherization 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 19, 2026 3,045 companies tracked

RevenueBase identified 3,045 weatherization contractors headquartered in the United States as of September 2026 and tracks 22,021 professional contacts across them, including 5,086 with verified work emails. Houston is the largest hub.

This list covers weatherization 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 19, 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 19, 2026 86% judged on-target in blind review

3,045Companies

22,021Contacts tracked

5,086Verified emails

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

The 25 largest weatherization contractors based in the United States

Ranked by team size

Top 25 of 3,045 weatherization contractors based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to weatherization 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	John W. Danforth Company	Indirect evidence	Tonawanda, NY, United StatesHQ checked Sep 19, 2026	501-1,000	415 contacts →
	Indirect evidence “We are powered by the best people in the industry.” Source: RevenueBase Database · checked Sep 19, 2026
2	Homeworks Energy, INC	Indirect evidence	Medford, MA, United StatesHQ checked Sep 19, 2026	201-500	356 contacts →
	Indirect evidence “At HomeWorks Energy, our mission is simple, literally: Energy Efficiency, Simplified.” Source: RevenueBase Database · checked Sep 19, 2026
3	Reliable Heating & AIR	Indirect evidence	Kennesaw, GA, United StatesHQ checked Sep 19, 2026	201-500	231 contacts →
	Indirect evidence “Since 1978, Reliable Heating & Air has been serving all of Metro Atlanta's communities offering heating, cooling, plumbing and electrical services, indoor air quality, duct…” Source: RevenueBase Database · checked Sep 19, 2026
4	EDA Contractors, INC	Partial evidence	Bensalem, PA, United StatesHQ checked Sep 19, 2026	201-500	193 contacts →
	Partial evidence “Founded in EDA Contractors holds an extensive portfolio and experience on the exterior envelope of commercial, institutional, and industrial buildings.” Source: RevenueBase Database · checked Sep 19, 2026
5	L&s Mechanical	Partial evidence	Richardson, TX, United StatesHQ checked Sep 19, 2026	501-1,000	186 contacts →
	Partial evidence “L&S Mechanical began as a Dallas-based contractor in 1985 and has grown over the years to have six locations out of Dallas, Fort Worth, Houston, San Antonio, and Austin.” Source: RevenueBase Database · checked Sep 19, 2026
6	USA Insulation	Indirect evidence	Cleveland, OH, United StatesHQ checked Sep 19, 2026	51-200	169 contacts →
	Indirect evidence “Established in 1977 and incorporated in 1985, USA Insulation has saved thousands of customers millions of dollars on their heating and air conditioning bills.” Source: RevenueBase Database · checked Sep 19, 2026
7	Hill York	Partial evidence	Dania Beach, FL, United StatesHQ checked Sep 19, 2026	201-500	168 contacts →
	Partial evidence “Hill York is a full service contractor that offers a full array of energy efficient air-conditioning services from concept to completion, maintenance to repair and everything in…” Source: RevenueBase Database · checked Sep 19, 2026
8	Marshalls INC	Indirect evidence	Lynnwood, WA, United StatesHQ checked Sep 19, 2026	n/a	168 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
9	Newcomb And Company	Partial evidence	Raleigh, NC, United StatesHQ checked Sep 19, 2026	201-500	159 contacts →
	Partial evidence “Founded in 1954, Newcomb and Company is a full-service mechanical contractor providing customers in the commercial, residential, and industrial sectors with innovative…” Source: RevenueBase Database · checked Sep 19, 2026
10	GSM Services	Indirect evidence	Gastonia, NC, United StatesHQ checked Sep 19, 2026	201-500	159 contacts →
	Indirect evidence “For nearly a century, GSM Services has built its reputation on reliability, honesty, expert service, and high-quality workmanship.” Source: RevenueBase Database · checked Sep 19, 2026
11	Willdan Performance Engineering	Indirect evidence	Denver, KS, United StatesHQ checked Sep 19, 2026	51-200	129 contacts →
	Indirect evidence “Willdan Performance Engineering specializes in energy and infrastructure improvement projects through design-build and performance contracting.” Source: RevenueBase Database · checked Sep 19, 2026
12	The K Company, INC	Indirect evidence	Akron, OH, United StatesHQ checked Sep 19, 2026	201-500	120 contacts →
	Indirect evidence “Since 1972, The K Company has been setting the standard in commercial, residential and industrial heating, air conditioning, ventilation and refrigeration systems.” Source: RevenueBase Database · checked Sep 19, 2026
13	JON Wayne Service Company	Partial evidence	San Antonio, TX, United StatesHQ checked Sep 19, 2026	51-200	110 contacts →
	Partial evidence “Jon Wayne Service Company is San Antonio's largest residential heating, air conditioning, plumbing, and electrical contractor.” Source: RevenueBase Database · checked Sep 19, 2026
14	Washington Energy Services	Indirect evidence	Lynnwood, WA, United StatesHQ checked Sep 19, 2026	201-500	109 contacts →
	Indirect evidence “There isn't one way to do things, but there is a right way.” Source: RevenueBase Database · checked Sep 19, 2026
15	Schwob Energy Services	Partial evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	501-1,000	106 contacts →
	Partial evidence “Schwob Energy Services is a General Construction Contractor that is consistently recognized for our use of proven world class construction methods in building energy related…” Source: RevenueBase Database · checked Sep 19, 2026
16	Chaparral Company	Indirect evidence	Waco, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	105 contacts →
	Indirect evidence “Chaparral Insulation has proudly served the mechanical insulation industry for more than 30 years.” Source: RevenueBase Database · checked Sep 19, 2026
17	Earthlight Technologies	Partial evidence	Ellington, CT, United StatesHQ checked Sep 19, 2026	51-200	99 contacts →
	Partial evidence “Earthlight is a Solar and Energy Efficiency contractor dedicated to meeting people’s ecofriendly needs by providing them with quality energy conservation solutions.” Source: RevenueBase Database · checked Sep 19, 2026
18	Florida Window And Door	Indirect evidence	Lake Worth, FL, United StatesHQ checked Sep 19, 2026	51-200	99 contacts →
	Indirect evidence “Florida Window and Door offers the widest selection of window and doors for residential, condominium and commercial applications.” Source: RevenueBase Database · checked Sep 19, 2026
19	Casteel Heating, Cooling, Plumbing & Electrical	Indirect evidence	Marietta, GA, United StatesHQ checked Sep 19, 2026	201-500	93 contacts →
	Indirect evidence “During the past 30 years, Casteel Heating, Cooling, Plumbing & Electrical has been one of the most respected names in metro Atlanta for heating and air conditioning.” Source: RevenueBase Database · checked Sep 19, 2026
20	Performance Windows	Indirect evidence	Pleasant Grove, UT, United StatesHQ checked Sep 19, 2026	51-200	91 contacts →
	Indirect evidence “Performance Windows is a window replacement services company.” Source: RevenueBase Database · checked Sep 19, 2026
21	Microf	Indirect evidence	Roswell, GA, United StatesHQ checked Sep 19, 2026	51-200	84 contacts →
	Indirect evidence “Microf was established to accommodate the growing demand for more flexible options surrounding the replacement of a residential heating/cooling system.” Source: RevenueBase Database · checked Sep 19, 2026
22	HALCO	Partial evidence	Phelps, NY, United StatesHQ checked Sep 19, 2026	51-200	82 contacts →
	Partial evidence “Halco is a highly accredited, national award-winning contractor that has been providing high-quality solutions to residential and commercial clients since 1984.” Source: RevenueBase Database · checked Sep 19, 2026
23	Electric & GAS Industries Association Egia	Partial evidence	Sacramento, CA, United StatesHQ checked Sep 19, 2026	51-200	79 contacts →
	Partial evidence “EGIA is a non-profit organization that serves a rapidly growing nationwide network of over installation contractors, regional distributors, product manufacturers and other trade…” Source: RevenueBase Database · checked Sep 19, 2026
24	Florida Energy Water & AIR	Indirect evidence	Maitland, FL, United StatesHQ checked Sep 19, 2026	201-500	72 contacts →
	Indirect evidence “Since its founding, Florida Energy Water & Air has been on a mission to help its customers maximize comfort and enjoyment at home by improving a home’s energy efficiency, as well…” Source: RevenueBase Database · checked Sep 19, 2026
25	SEMCO	Indirect evidence	Birmingham, AL, United StatesHQ checked Sep 19, 2026	n/a	64 contacts →
	Indirect evidence “If your business is interested in cutting energy costs and securing little known incentives to help fund initial project costs, SEMCO can help you.” Source: RevenueBase Database · checked Sep 19, 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: weatherization 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 weatherization contractors.
Partial evidence: Its own public description names part of weatherization contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name weatherization 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 3,045 weatherization contractors based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 5,086 reachable decision-makers.

Free signup · no credit card

View the full list →

Weatherization contractors based in the United States at a glance

As of Sep 19, 2026

23.1%Verified-email coverage

7.2Average contacts per company

11-50Median size (employees)

1.0%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,485

11-50

1,211

51-200

272

201-500

501-1,000

1,001-5,000

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 3,045 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 weatherization 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 “weatherization 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 weatherization 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 weatherization 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, 5,086 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 19, 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.

Weatherization 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 weatherization 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 weatherization contractors are there based in the United States?

RevenueBase identified 3,045 weatherization 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?

John W. Danforth Company, headquartered in Tonawanda, tops this list with the largest team on record.

Which city has the most weatherization contractors?

Houston leads with 29 headquartered companies, followed by New York (28) and Austin (26).

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 5,086 verified decision-maker contacts tracked across these 3,045 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 19, 2026.

Ready to reach these companies? Verified emails and direct dials for all 3,045 weatherization contractors based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Weatherization contractors by geography

Browse the directory

Browse: Companies home · All United States lists · All Weatherization contractors lists · New lists

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.