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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint744,173 companies indexed · Last updated: today
DirectoryEnergy & Environment

Energy & Environment

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IndustryEnergy & Environment
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Matching companies

9'016 companies found

Hauser Solutions GmbH Logo

Hauser Solutions GmbH 

Uerikon · Since 2020

The core activity of Hauser Solutions GmbH is real estate brokerage and consulting, particularly in the sale and purchase of real estate, as well as in the valuation and development of real estate. The company also offers services such as construction management and renovation of real estate.

Solar & Photovoltaics
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HDT Elektro GmbH Logo

HDT Elektro GmbH 

Tägerwilen · Since 2017

HDT Elektro GmbH provides electrical engineering services, carrying out installations for new builds and renovations as well as maintenance and repairs, and planning, installing and servicing lighting systems, photovoltaic installations, e‑mobility charging solutions, network/telephony, security systems and smart‑home automation.

Electrical Planning & InstallationSolar & Photovoltaics
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HEBT GmbH Logo

HEBT GmbH 

Kriens · Since 2023

HEBT GmbH is a service company operating in timber construction and photovoltaic installation. It provides mounting of photovoltaic systems (DC side), general carpentry and assembly work, construction of wooden terraces, and transport services with a van featuring a large loading platform.

Solar & Photovoltaics
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Heer AG, Wärmetechnik Logo

Heer AG, Wärmetechnik 

Laufen · Since 1988

The core activity of Heer AG Wärmetechnik is the planning, installation, maintenance and repair of heating systems, including oil, gas, pellet and wood heating systems, heat pumps and solar systems, as well as burner service and the renovation of old heating systems, particularly in the field of building technology.

Solar & Photovoltaics
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Herding AG Logo

Herding AG 

Aadorf · Since 1988

Herding AG develops and supplies industrial filtration and dust-collection systems using sinter‑plate surface filtration to separate solids from gases. The company provides complete solutions and filter elements, including consulting, customer-specific design, manufacture, installation, commissioning, maintenance, and safety and digital services.

Waste Management Industry
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hpwtec AG Logo

hpwtec AG 

Langnau Im Emmental · Since 2010

The core activity of hpwtec AG is the development, manufacture and construction of thermal solar systems, photovoltaic systems, solar storage systems and solar filling stations. The company also offers plant-specific solar storage systems and trading products for solar energy systems.

Solar & Photovoltaics
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HSE Haustechnik AG Logo

HSE Haustechnik AG 

Geuensee · Since 2017

The core activity of HSE Haustechnik AG is the planning, installation and maintenance of building technology systems, particularly in the areas of: * Heating (heat distribution, heating systems) * Sanitary (sanitary installations, bathroom renovations) * Ventilation (ventilation and air conditioning systems) * Solar (thermal solar systems) The company offers services for new and renovation projects and positions itself as a competent partner for heat, water and solar energy.

Solar & Photovoltaics
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Hug AG Tankrevisionen-Tanksanierungen Logo

Hug AG Tankrevisionen-Tanksanierungen 

Untervaz · Since 1975

The core activity of Hug AG is the provision of services related to oil tank facilities, specifically: tank renovation (cleaning and renovation of existing tank facilities), tank revision (regular inspection and maintenance of tank facilities), and tank dismantling (dismantling and disposal of old oil tanks). The company offers these services to various customers, including homeowners, companies, municipal administrations, and property management companies.

Waste Management Industry
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Hugo Keiser AG Logo

Hugo Keiser AG 

Zweidlen · Since 1989

The core activity of Hugo Keiser AG encompasses the planning, implementation and maintenance of solutions in the field of building technology and renewable energies. This includes in particular: heating construction and renovations (heat pumps, wood/pellet heating systems, ground source heat pumps, oil and gas heating systems), sanitary work (bathrooms, water softening/demineralization, sanitary repairs, boiler service), and solar systems (photovoltaics, solar thermal systems, solar roof tiles, storage/battery systems). The company thus offers comprehensive solutions for building technology and renewable energies, positioning itself as a competent contact for overall solutions in the field of sustainable and economically viable energy generation.

Energy SuppliersSolar & Photovoltaics
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Hyphen GmbH Logo

Hyphen GmbH 

Zurich · Since 2019

The company Hyphen GmbH/Sàrl primarily focuses on architecture, design, and education, particularly in the field of sustainable development and environmental education. The core activities include: * Architecture: Renovations, conversions, and new constructions with a focus on participatory, low-tech approaches and close collaboration with clients. * Design: Developing concepts and solutions for sustainable and socially responsible design of spaces and processes. * Education: Conducting workshops and projects aimed at raising awareness and empowering people, especially children and young adults, to take action on environmental and sustainability issues. A specific example of these activities is the project 'Zweirad-Celsius', a mobile studio serving as a platform for exchanging ideas and experiences on environmental and sustainability topics.

Sustainability Sector
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Frequently asked questions

Searching the directory

How the search works, what each filter means, and how the results come together.

What can I search for in the directory?
The search field matches company names, industries and places. Beyond that you can filter by Industry (18 categories based on the NOGA classification), Size (number of employees), Region (canton, language region or postal code) and Special (keywords and entry date). Filters combine freely; the active ones appear as chips below the filter bar and can be removed there individually.
How do keywords work?
Keywords search the description and stated purpose of each company — the text that goes beyond the company name. Multiple keywords are combined with OR: every additional keyword widens the set of matches rather than narrowing it.
What belongs in the postal code field?
A single postal code (e.g. 8000) or a range (e.g. 1000-1010). The field accepts postal codes only — for place names, use Canton or Language region.
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How is organisation size determined?
Size reflects the number of employees and is calculated from publicly available information by a model developed in-house. It is a best-possible estimate, not an official figure.
What does the Verified label mean?
Verified means the entry is tied to a UID (Swiss business identification number) and therefore links back to the official Swiss business register. The label speaks to the company's identity — it is not a rating of its performance.

Source: Federal Statistical Office, UID register

How do I sort the results?
Use the dropdown above the list: Relevance, Name (A–Z), Best rating, Most reviews or Longest established. You can also switch between list and map view and set how many results appear per page.