Company lists · Data refreshed September 2026

Top 25 Heating contractors worldwide

Name: Heating contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 28,509 companies tracked

RevenueBase identified 28,509 heating contractors worldwide as of September 2026 and tracks 194,463 professional contacts across them, including 53,765 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers heating contractors worldwide, 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 16, 2026. Country and city lists for heating contractors follow the table.

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 16, 2026 86% judged on-target in blind review

28,509Companies

194,463Contacts tracked

53,765Verified emails

0Mobile numbers

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The 25 largest heating contractors worldwide

Ranked by team size

Top 25 of 28,509 heating contractors worldwide, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to heating 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	Johnstone Supply	Partial evidence	Portland, OR, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,664 contacts →
	Partial evidence “Making it easier for HVACR contractors to do business.” Source: RevenueBase Database · checked Sep 16, 2026
2	Comfort Systems USA	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	10001+	1,330 contacts →
	Indirect evidence “Comfort Systems USA \| Quality People.” Source: RevenueBase Database · checked Sep 16, 2026
3	Bravida Danmark A S	Indirect evidence	Brøndby, DenmarkHQ checked Sep 16, 2026	1,001-5,000	1,298 contacts →
	Indirect evidence “Bravida Danmark er blandt landets største tekniske installations- og servicevirksomheder med over medarbejdere i byer landet over, og vi er en arbejdsplads, der har plads til alle.” Source: RevenueBase Database · checked Sep 16, 2026
4	Proxiserve	Indirect evidence	Levallois-perret, FranceHQ checked Sep 16, 2026	1,001-5,000	935 contacts →
	Indirect evidence “A major player in the energy transition and leader in home services, PROXISERVE provides its customers with innovative solutions enabling them to reduce their energy consumption…” Source: RevenueBase Database · checked Sep 16, 2026
5	BAXI	Partial evidence	Warwick, United KingdomHQ checked Sep 16, 2026	1,001-5,000	850 contacts →
	Partial evidence “We're leading the energy transition to zero carbon, by offering complete residential and commercial heating and hot water solutions.” Source: RevenueBase Database · checked Sep 16, 2026
6	AHERN	Partial evidence	Fond Du Lac, WI, United StatesHQ checked Sep 16, 2026	1,001-5,000	849 contacts →
	Partial evidence “Ahern is a mechanical and fire protection contractor specializing in HVAC, Plumbing, Building Controls, Sprinkler, Extinguisher & Alarm and Fabrication for construction and…” Source: RevenueBase Database · checked Sep 16, 2026
7	Feenstra	Indirect evidence	Lelystad, NetherlandsHQ checked Sep 16, 2026	1,001-5,000	781 contacts →
	Indirect evidence “Sinds het ontstaan in 1947 is Feenstra marktleider in installatietechniek met een nationale dekking.” Source: RevenueBase Database · checked Sep 16, 2026
8	HTS Engineering	Indirect evidence	Toronto, ON, CanadaHQ checked Sep 16, 2026	1,001-5,000	714 contacts →
	Indirect evidence “Your success is our success.” Source: RevenueBase Database · checked Sep 16, 2026
9	Chromalox	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 16, 2026	1,001-5,000	635 contacts →
	Partial evidence “When industrial operations depend on heat that simply cannot fail, Chromalox brings unmatched technical knowledge and high‑performance electric heating solutions that stand the…” Source: RevenueBase Database · checked Sep 16, 2026
10	ONE Hour Heating & AIR Conditioning	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 16, 2026	1,001-5,000	526 contacts →
	Partial evidence “When homeowners want a reliable heater or air conditioning system that they don’t have to think about, they call One Hour Heating & Air Conditioning.” Source: RevenueBase Database · checked Sep 16, 2026
11	Texas Airsystems	Indirect evidence	Irving, TX, United StatesHQ checked Sep 16, 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 16, 2026
12	Mingledorff's	Indirect evidence	Norcross, GA, United StatesHQ checked Sep 16, 2026	501-1,000	483 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026
13	Horizon Services, LLC	Partial evidence	Wilmington, DE, United StatesHQ checked Sep 16, 2026	501-1,000	448 contacts →
	Partial evidence “Horizon Services is the premier heating, air conditioning, plumbing, drain cleaning and sewer services company in Delaware (New Castle County & Kent County), Pennsylvania…” Source: RevenueBase Database · checked Sep 16, 2026
14	Romanoff Group	Partial evidence	Gahanna, OH, United StatesHQ checked Sep 16, 2026	1,001-5,000	431 contacts →
	Partial evidence “The Romanoff Group of Companies has been dedicated to providing specialized electrical, plumbing, and heating and cooling services since 1992.” Source: RevenueBase Database · checked Sep 16, 2026
15	Ferroli Group	Partial evidence	San Bonifacio, ItalyHQ checked Sep 16, 2026	1,001-5,000	418 contacts →
	Partial evidence “Comfort, designed around you – Since 1955, Ferroli has been a trusted name in HVAC, delivering innovative solutions for heating, cooling and hot water that combine comfort, energy…” Source: RevenueBase Database · checked Sep 16, 2026
16	John W. Danforth Company	Indirect evidence	Tonawanda, NY, United StatesHQ checked Sep 16, 2026	501-1,000	415 contacts →
	Indirect evidence “We are powered by the best people in the industry.” Source: RevenueBase Database · checked Sep 16, 2026
17	Strada Services	Indirect evidence	Sanford, FL, United StatesHQ checked Sep 16, 2026	1,001-5,000	391 contacts →
	Indirect evidence “Strada Services is a full service electrical, security, and air conditioning contracting company servicing residential, commercial, and industrial customers in Florida and in the…” Source: RevenueBase Database · checked Sep 16, 2026
18	Superheat	Indirect evidence	New Lenox, IL, United StatesHQ checked Sep 16, 2026	501-1,000	376 contacts →
	Indirect evidence “Superheat was founded on the principle that cutting-edge technology can offer a Better.” Source: RevenueBase Database · checked Sep 16, 2026
19	Aire Serv Heating And AIR Conditioning	Indirect evidence	Waco, TX, United StatesHQ checked Sep 16, 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 16, 2026
20	United Mechanical	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 16, 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 16, 2026
21	Logista Hometech	Indirect evidence	Arras, FranceHQ checked Sep 16, 2026	1,001-5,000	344 contacts →
	Indirect evidence “Spécialiste de la maintenance immobilière, nous entretenons et dépannons les équipements de chauffage, VMC, plomberie, sanitaire, climatisation… pour les bailleurs sociaux et les…” Source: RevenueBase Database · checked Sep 16, 2026
22	Brady Services	Indirect evidence	Greensboro, NC, United StatesHQ checked Sep 16, 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 16, 2026
23	Lochinvar, LLC	Indirect evidence	Lebanon, TN, IndiaHQ checked Sep 16, 2026	201-500	340 contacts →
	Indirect evidence “Lochinvar, LLC is a leading manufacturer of high-efficiency water heaters, boilers, pool heaters and custom pre-piped packaged systems.” Source: RevenueBase Database · checked Sep 16, 2026
24	Petro Home Services	Partial evidence	Stamford, CT, United StatesHQ checked Sep 16, 2026	1,001-5,000	339 contacts →
	Partial evidence “We're America’s #1 local home heating oil and total home comfort services provider, with over 100 years experience helping customers save and keep comfortable at home.” Source: RevenueBase Database · checked Sep 16, 2026
25	Space Engineering Services LTD	Partial evidence	Bristol, United KingdomHQ checked Sep 16, 2026	201-500	312 contacts →
	Partial evidence “Space Engineering Services is the UK’s leading provider of refrigeration, heating, ventilation and air conditioning services.” Source: RevenueBase Database · checked Sep 16, 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: heating 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 heating contractors.
Partial evidence: Its own public description names part of heating contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name heating 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 28,509 heating contractors worldwide

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Heating contractors worldwide at a glance

As of Sep 16, 2026

27.6%Verified-email coverage

6.8Average contacts per company

1-10Median size (employees)

0.8%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

14,609

11-50

10,171

51-200

2,442

201-500

362

501-1,000

1,001-5,000

5,001-10,000

10001+

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 heating 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.
Coverage: 29 countries, largest first: the United States, the United Kingdom, France, Canada, Germany, Italy, the Netherlands, Spain, Belgium, Australia and 19 more. Country and city lists for heating contractors are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “heating 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 heating 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 heating contractors, and records with no verified work email.
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, 53,765 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 16, 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.

Heating contractors by location

106 lists · largest first

Every Heating contractors list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 heating 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 heating contractors are there worldwide?

RevenueBase identified 28,509 heating contractors worldwide 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?

Johnstone Supply, headquartered in Portland, tops this list with the largest team on record.

Which country has the most heating contractors?

The United States leads with 14,556 companies, followed by the United Kingdom (2,982) and France (2,077). Every heating contractors list by country and city is linked on this page.

Which city has the most heating contractors?

London leads with 219 headquartered companies, followed by Houston (172) and New York (163).

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 53,765 verified decision-maker contacts tracked across these 28,509 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 16, 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.