Company lists · Data refreshed September 2026

Top 25 Heat recovery system companies based in the United States

Name: Heat recovery system companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 108 companies tracked

RevenueBase identified 108 heat recovery system companies headquartered in the United States as of September 2026 and tracks 2,504 professional contacts across them, including 1,055 with verified work emails. Tulsa is the largest hub.

This list covers heat recovery system companies 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 20, 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 20, 2026 86% judged on-target in blind review

108Companies

2,504Contacts tracked

1,055Verified emails

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The 25 largest heat recovery system companies based in the United States

Ranked by team size

Top 25 of 108 heat recovery system companies based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to heat recovery system companies: 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	API Heat Transfer	Partial evidence	Buffalo, NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	364 contacts →
	Partial evidence “API Heat Transfer is a leading global provider of heat transfer solutions, recognized for delivering innovative, energy-efficient equipment for more than 140 years.” Source: RevenueBase Database · checked Sep 20, 2026
2	Thermal Engineering International USA INC	Indirect evidence	La Palma, CA, United StatesHQ checked Sep 20, 2026	201-500	219 contacts →
	Indirect evidence “At TEi, we help the power and process industries operate safely, sustainably, and without costly downtime.” Source: RevenueBase Database · checked Sep 20, 2026
3	Vogt Power International	Strong evidence	Louisville, KY, United StatesHQ checked Sep 20, 2026	201-500	209 contacts →
	Strong evidence “Vogt Power International Inc, headquartered in Louisville, Kentucky, is a global leader in the design, manufacturing, and supply of Heat Recovery Steam Generators (HRSGs) and…” Source: RevenueBase Database · checked Sep 20, 2026
4	Nooter Eriksen, INC	Strong evidence	St. Louis, MO, United StatesHQ checked Sep 20, 2026	201-500	198 contacts →
	Strong evidence “Nooter/Eriksen, the world's leading independent supplier of Natural Circulation Heat Recovery Steam Generators (HRSG) behind gas turbines, is a single source supplier of custom…” Source: RevenueBase Database · checked Sep 20, 2026
5	Renewaire, LLC	Strong evidence	Waunakee, WI, United StatesHQ checked Sep 20, 2026	51-200	91 contacts →
	Strong evidence “For over 40 years, RenewAire has been manufacturing energy recovery ventilators (ERVs) and dedicated outdoor air systems (DOAS).” Source: RevenueBase Database · checked Sep 20, 2026
6	Hrst, INC	Strong evidence	Minnetonka, MN, United StatesHQ checked Sep 20, 2026	51-200	80 contacts →
	Strong evidence “We are a power plant technical services and products company specializing in Heat Recovery Steam Generators (HRSGs), waste heat boilers and smaller gas/oil-fired power boilers.” Source: RevenueBase Database · checked Sep 20, 2026
7	BD Energy Systems, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	51-200	65 contacts →
	Partial evidence “BD Energy Systems LLC located in Houston, TX, USA is a world leading engineering company operating in the Petrochemical, Fertilizer, Refining, and Gas Processing industry…” Source: RevenueBase Database · checked Sep 20, 2026
8	Tecogen INC	Strong evidence	North Billerica, MA, United StatesHQ checked Sep 20, 2026	51-200	64 contacts →
	Strong evidence “Tecogen is a leading manufacturer of Combined Heat and Power products including natural gas engine-driven cogeneration, air conditioning systems and high efficiency water heaters…” Source: RevenueBase Database · checked Sep 20, 2026
9	Envirosep	Strong evidence	Georgetown, SC, United StatesHQ checked Sep 20, 2026	51-200	62 contacts →
	Strong evidence “Envirosep Company Overview: Envirosep designs and manufactures integrated solutions for fluid handling, heat transfer and energy recovery.” Source: RevenueBase Database · checked Sep 20, 2026
10	Thermalnetics	Partial evidence	Auburn Hills, MI, United StatesHQ checked Sep 20, 2026	51-200	53 contacts →
	Partial evidence “ThermalNetics, a member of Daikin Group, is on the leading edge of energy recovery and environmentally responsible heating and cooling.” Source: RevenueBase Database · checked Sep 20, 2026
11	XETEX	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 20, 2026	201-500	53 contacts →
	Indirect evidence “Helping buildings breathe better.” Source: RevenueBase Database · checked Sep 20, 2026
12	Diversified Heat Transfer DHT	Strong evidence	Towaco, NJ, United StatesHQ checked Sep 20, 2026	51-200	47 contacts →
	Strong evidence “Diversified Heat Transfer (DHT), is a leading engineering and manufacturing company of heat exchange equipment and systems for the residential, commercial, and industrial markets.” Source: RevenueBase Database · checked Sep 20, 2026
13	Enervex INC	Indirect evidence	Alpharetta, GA, United StatesHQ checked Sep 20, 2026	51-200	45 contacts →
	Indirect evidence “Welcome to ENERVEX.” Source: RevenueBase Database · checked Sep 20, 2026
14	Steam Solutions	Partial evidence	New Orleans, LA, United StatesHQ checked Sep 20, 2026	51-200	43 contacts →
	Partial evidence “Steam Solutions keeps commercial and industrial facilities operating at peak performance through its specialized knowledge of steam systems.” Source: RevenueBase Database · checked Sep 20, 2026
15	Ship & Shore Environmental, INC	Indirect evidence	Signal Hill, CA, United StatesHQ checked Sep 20, 2026	11-50	37 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
16	Furnace Improvements Services	Strong evidence	Sugar Land, TX, United StatesHQ checked Sep 20, 2026	11-50	37 contacts →
	Strong evidence “FURNACE IMPROVEMENTS SERVICES (FIS) has been actively providing value-added solutions for Fired Heaters, Boilers, and Waste Heat Recovery Units to end-users around the world for…” Source: RevenueBase Database · checked Sep 20, 2026
17	Airxchange	Indirect evidence	Rockland, MA, United StatesHQ checked Sep 20, 2026	51-200	32 contacts →
	Indirect evidence “Delivering affordable fresh air.” Source: RevenueBase Database · checked Sep 20, 2026
18	CPL Systems	Partial evidence	Lafayette, LA, United StatesHQ checked Sep 20, 2026	11-50	32 contacts →
	Partial evidence “CPL Systems, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
19	Skyven Technologies	Strong evidence	Farmers Branch, TX, United StatesHQ checked Sep 20, 2026	11-50	31 contacts →
	Strong evidence “Skyven Technologies works with industrial manufacturers by recovering waste heat to produce clean, emissions-free steam using their Arcturus steam generating heat pump.” Source: RevenueBase Database · checked Sep 20, 2026
20	Enerquip Thermal Solutions	Indirect evidence	Medford, WI, United StatesHQ checked Sep 20, 2026	51-200	27 contacts →
	Indirect evidence “Enerquip has been a trusted provider of American-made sanitary and industrial heating and cooling solutions since 1985.” Source: RevenueBase Database · checked Sep 20, 2026
21	Opti Temp, INC	Indirect evidence	Traverse City, MI, United StatesHQ checked Sep 20, 2026	11-50	27 contacts →
	Indirect evidence “Opti Temp Inc.” Source: RevenueBase Database · checked Sep 20, 2026
22	Fisen Corporation	Partial evidence	Dutton, MI, United StatesHQ checked Sep 20, 2026	11-50	25 contacts →
	Partial evidence “At Fisen, we foster innovation to supply you with cutting edge heating and cooling solutions, from controls through energy recovery.” Source: RevenueBase Database · checked Sep 20, 2026
23	Stone Mountain Technologies, INC	Partial evidence	Piney Flats, TN, United StatesHQ checked Sep 20, 2026	11-50	25 contacts →
	Partial evidence “Stone Mountain Technologies, Inc.(SMTI) develops and manufactures high-temperature gas absorption heat pumps under the ANESI® brand.” Source: RevenueBase Database · checked Sep 20, 2026
24	Pascal	Indirect evidence	Cambridge, MA, United StatesHQ checked Sep 20, 2026	1-10	23 contacts →
	Indirect evidence “We're hiring!” Source: RevenueBase Database · checked Sep 20, 2026
25	Tulsa Heaters INC	Indirect evidence	Tulsa, OK, United StatesHQ checked Sep 20, 2026	11-50	23 contacts →
	Indirect evidence “Tulsa Heaters, Inc.(THI) is a private Engineering firm located in Tulsa, OK, celebrating 35 years of service to the global oil & gas industry.” Source: RevenueBase Database · checked Sep 20, 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: heat recovery system companies. 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 heat recovery system companies.
Partial evidence: Its own public description names part of heat recovery system companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name heat recovery system companies. 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 108 heat recovery system companies based in the United States

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Heat recovery system companies based in the United States at a glance

As of Sep 20, 2026

42.1%Verified-email coverage

23.2Average contacts per company

11-50Median size (employees)

7.4%Largest-city concentration · Tulsa

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

5,001-10,000

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 108 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 heat recovery system companies, 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 “heat recovery system companies”. 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 heat recovery system companies), 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 heat recovery system companies, 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, 1,055 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 20, 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.

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 heat recovery system companies, 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 heat recovery system companies are there based in the United States?

RevenueBase identified 108 heat recovery system companies 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?

API Heat Transfer, headquartered in Buffalo, tops this list with the largest team on record.

Which city has the most heat recovery system companies?

Tulsa leads with 8 headquartered companies, followed by Houston (4) and Cambridge (2).

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 1,055 verified decision-maker contacts tracked across these 108 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 20, 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.