Company lists · Data refreshed September 2026

Top 25 Energy efficiency consulting firms based in Switzerland

Name: Energy efficiency consulting firms based in Switzerland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 2, 2026 237 companies tracked

RevenueBase identified 237 energy efficiency consulting firms headquartered in Switzerland as of September 2026 and tracks 1,430 professional contacts across them, including 517 with verified work emails and 41 with mobile numbers. Zurich is the largest hub.

This list covers energy efficiency consulting firms headquartered in Switzerland, 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 2, 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 RevenueBase Smart Search rating on every row Refreshed Sep 2, 2026 86% judged on-target in blind review

237Companies

1,430Contacts tracked

517Verified emails

41Mobile numbers

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The 25 largest energy efficiency consulting firms based in Switzerland

Ranked by team size

Top 25 of 237 energy efficiency consulting firms based in Switzerland, ranked by team size, largest first. Data refreshed Sep 2, 2026. RevenueBase Smart Search rates how each company's information relates to energy efficiency consulting firms: 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	Sontex SA	Partial evidence	Sonceboz-Sombeval, Switzerland	51-200	78 contacts →
	Partial evidence “For over 30 years, Sontex has offered innovative systems for the precise collection of energy consumption data.” Source: RevenueBase Database · checked Sep 2, 2026
2	Weinmann-Energies SA	Partial evidence	Neuchatel, Switzerland	51-200	47 contacts →
	Partial evidence “Weinmann-Energies est un bureau d’ingénieurs-conseils EPFL-SIA-SuisseIng.” Source: RevenueBase Database · checked Sep 2, 2026
3	Anex Ingenieure AG	Partial evidence	Basel, Switzerland	51-200	40 contacts →
	Partial evidence “Anex Ingenieure ist ein Beratungs- und Planungsunternehmen für Gebäudetechnik, das ressourcenschonende Energie- und Medienkonzepte für Prozesse, Gebäude und Areale entwickelt.” Source: RevenueBase Database · checked Sep 2, 2026
4	Lemon Consult AG	Strong evidence	Basel, Switzerland	11-50	36 contacts →
	Strong evidence “Lemon Consult is a specialized engineering and consulting office for energy efficiency, sustainability and renewable energies in the area of building and technical systems.” Source: RevenueBase Database · checked Sep 2, 2026
5	Caeli Ingénierie	Partial evidence	Carouge, Switzerland	11-50	32 contacts →
	Partial evidence “Bureau d'études CVCSE, Energie, Automatisme du bâtiment, MCR, Physique du bâtiment.” Source: RevenueBase Database · checked Sep 2, 2026
6	Energie-Agentur DER Wirtschaft Agence DE L Énergie Pour L Économie	Partial evidence	Zurich, Switzerland	51-200	31 contacts →
	Partial evidence “Seit 2001 bieten wir unseren Teilnehmern unter der Einhaltung von Energieträger- und Produkteneutralität einen Rund-um-Service im Energie-Management mit bewährten und von Behörden…” Source: RevenueBase Database · checked Sep 2, 2026
7	AZ Ingénieurs SA	Indirect evidence	Lausanne, Switzerland	11-50	27 contacts →
	Indirect evidence “La marque az ingénieurs regroupe des sociétés privées réunissant des ingénieurs-conseils dans les domaines de l'énergie, de la sécurité et des installations techniques pour le…” Source: RevenueBase Database · checked Sep 2, 2026
8	Ecco2 Solutions AG	Strong evidence	Givisiez, Switzerland	11-50	25 contacts →
	Strong evidence “ECCO2 Solutions AG offers innovative services for energy efficiency in buildings.” Source: RevenueBase Database · checked Sep 2, 2026
9	Enastra AG	Partial evidence	Zurich, Switzerland	11-50	25 contacts →
	Partial evidence “Das Vernetzen der Fachgebiete Strategie & Konzept, Bauherrentreuhand, Energiecontrolling und Nebenkosten ist das Fundament unserer Kernkompetenz.” Source: RevenueBase Database · checked Sep 2, 2026
10	Weisskopf Partner Gmbh	Partial evidence	Zurich, Switzerland	11-50	25 contacts →
	Partial evidence “Die Steigerung von Energieeffizienz und den Einsatz von erneuerbaren Energien verfolgen wir mit Herzblut.” Source: RevenueBase Database · checked Sep 2, 2026
11	Tecnoservice Engineering SA	Indirect evidence	Fribourg, Switzerland	51-200	25 contacts →
	Indirect evidence “TECNOSERVICE ENGINEERING SA est un bureau d’études et d’ingénieurs conseils pour les installations techniques et études énergétiques liées au bâtiment et à l’industrie.” Source: RevenueBase Database · checked Sep 2, 2026
12	Ingenieurbüro IEM AG	Partial evidence	Bern, Switzerland	11-50	21 contacts →
	Partial evidence “Wir sind ein national tätiges, anerkanntes Ingenieurbüro für Energie- und Gebäudetechnikplanungen, führend in unseren Kompetenzen und Dienstleistungen.” Source: RevenueBase Database · checked Sep 2, 2026
13	SB Technique SA	Indirect evidence	Geneve, Switzerland	11-50	18 contacts →
	Indirect evidence “SB technique est un bureau d'Ingénieur Conseil en chauffage, ventilation, climatisation et sécurité du bâtiment développant des concepts énergétiques ambitieux pour des…” Source: RevenueBase Database · checked Sep 2, 2026
14	Guggisberg Kurz AG	Indirect evidence	Ostermundigen, Switzerland	51-200	18 contacts →
	Indirect evidence “Mit über 90 erfahrene Mitarbeitenden ist die Guggisberg Kurz AG in der Lage sowohl grosse Objekte auszuführen, als auch sehr flexibel zu agieren.” Source: RevenueBase Database · checked Sep 2, 2026
15	Adolf Krebs AG	Partial evidence	Grund Bei Gstaad, Switzerland	51-200	16 contacts →
	Partial evidence “Aber ebenso viel mit harten Kalkulationen, Energiemanagement, mit Wissen, was zu tun ist.” Source: RevenueBase Database · checked Sep 2, 2026
16	Gestical SA	Strong evidence	Cadempino, Switzerland	11-50	15 contacts →
	Strong evidence “Your partner for energy saving in Switzerland With our energy services, we ensure efficient management of heating, air conditioning, water and electricity consumption, and do so…” Source: RevenueBase Database · checked Sep 2, 2026
17	Enerplan AG	Partial evidence	Olten, Switzerland	11-50	15 contacts →
	Partial evidence “Wir sind ein Ingenieurbüro für Haus- Energie- und Gebäudetechnik und sind seit 1981 in Bern, Solothurn, Olten und Zürich tätig.” Source: RevenueBase Database · checked Sep 2, 2026
18	Home Intelligence Sàrl	Indirect evidence	Lonay, Switzerland	11-50	15 contacts →
	Indirect evidence “Spécialiste en optimisation énergétique!” Source: RevenueBase Database · checked Sep 2, 2026
19	Lenum AG	Partial evidence	Buchs Kanton, Switzerland	11-50	13 contacts →
	Partial evidence “Die Lenum AG ist Dienstleistungspartner in den Bereichen Licht, Energie und Umwelt für Firmen, Private und die öffentliche Hand.” Source: RevenueBase Database · checked Sep 2, 2026
20	P P Project Solutions SA	Indirect evidence	Yverdon, Switzerland	11-50	12 contacts →
	Indirect evidence “p+p project est votre partenaire pour tout projet industriel innovant.” Source: RevenueBase Database · checked Sep 2, 2026
21	Oekowatt AG	Partial evidence	Luzern, Switzerland	11-50	12 contacts →
	Partial evidence “Nachhaltige Energieverwendung ist sowohl für Private, Firmen und auch für die öffentliche Hand von grosser Bedeutung.” Source: RevenueBase Database · checked Sep 2, 2026
22	Energestion SA	Partial evidence	Les Acacias, Switzerland	11-50	12 contacts →
	Partial evidence “Energestion SA est un bureau d'ingénieurs conseils du bâtiment et en industrie.” Source: RevenueBase Database · checked Sep 2, 2026
23	Imboden Solista AG	Partial evidence	Horw, Switzerland	11-50	11 contacts →
	Partial evidence “UNSERE KOMPETENZEN Mit unseren Kernkompetenzen ENERGIE – TECHNIK – BERATUNG sind wir Ihr Partner für die Gebäudetechnikplanung UNSERE KUNDEN Sie als unsere Kunden sind unsere…” Source: RevenueBase Database · checked Sep 2, 2026
24	DM Energieberatung AG	Partial evidence	Brugg, Switzerland	11-50	11 contacts →
	Partial evidence “DM Energieberatung AG is a renewables & environment company based out of Paradiesstrasse 5, Brugg, Aargau, Switzerland.” Source: RevenueBase Database · checked Sep 2, 2026
25	Emch Berger Revelio AG	Indirect evidence	Bern, Switzerland	11-50	10 contacts →
	Indirect evidence “Die Emch+Berger Revelio AG ist ein Unternehmen der 1953 gegründeten Emch+Berger Gruppe.” Source: RevenueBase Database · checked Sep 2, 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: energy efficiency consulting firms. 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 energy efficiency consulting firms.
Partial evidence: Its own public description names part of energy efficiency consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy efficiency consulting firms. 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 237 energy efficiency consulting firms based in Switzerland

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Energy efficiency consulting firms based in Switzerland at a glance

As of Sep 2, 2026

36.2%Verified-email coverage

2.9%Mobile-number coverage

6.0Average contacts per company

1-10Median size (employees)

7.2%Largest-city concentration · Zurich

Sep 2, 2026Page data refreshed

Companies by employee count

1-10

170

11-50

51-200

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 energy efficiency consulting firms, 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 Switzerland whose own description of what they do matches “energy efficiency consulting firms”. 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 energy efficiency consulting firms), 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 energy efficiency consulting firms, and records with no verified work email. Companies headquartered outside Switzerland 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, 517 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 2, 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 energy efficiency consulting firms, 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 energy efficiency consulting firms are there based in Switzerland?

RevenueBase identified 237 energy efficiency consulting firms headquartered in Switzerland 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?

Sontex SA, headquartered in Sonceboz-Sombeval, tops this list with the largest team on record.

Which city has the most energy efficiency consulting firms?

Zurich leads with 17 headquartered companies, followed by Lausanne (7) and Geneve (7).

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 517 verified decision-maker contacts tracked across these 237 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 2, 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.