Solar & Photovoltaics in
Herisau

Diener Haustechnik AG

Since 2010 · 1–10 empl.·4.7(13)

The core activity of Diener Haustechnik AG encompasses the areas of sanitary installations, heating technology, solar technology and tank revisions.

Neosolar AG

Since 2002 · 1–10 empl.·5.0(8)

The core activity of Neosolar AG is the planning, consulting, installation and maintenance of solar systems, energy storage systems and electromobility solutions for private and commercial customers in Switzerland.

Nigg Energietechnik AG

Since 1998 · 11–20 empl.·4.8(6)

The company provides services in the field of heating, ventilation and air conditioning.

Elektro Knöpfel AG

Since 1989 · 1–10 empl.·5.0(7)

The core activity of Elektro Knöpfel AG includes the planning and installation of electrical systems, including lighting, photovoltaics, network and internet solutions, telephony and TV systems.

AST Eissport- und Solaranlagenbau AG

Since 1991 · 21–50 empl.

The core activity of AST Eis- und Solartechnik GmbH is the planning, development and realization of ice rink and solar technologies, including the manufacture and distribution of ice rinks (mobile and stationary), solar systems, artificial turf heating systems, outdoor pool heating systems and heat pumps. The company also offers solutions for ice hockey, inline hockey and recreational facilities and has a comprehensive portfolio of products and services in this area.

GT Solar Invest AG

Since 2010 · 11–20 empl.

The core activity of GT Solar Invest AG is the planning, implementation and maintenance of solar systems for companies and private individuals, particularly in the field of solar contracting, where the system is financed, installed and maintained by the company, while the customer uses the generated solar power, thereby reducing their energy costs and minimizing their CO2 footprint.

Lumisol GmbH

Since 2013 · 1–10 empl.

Lumisol GmbH provides photovoltaic systems and related services for residential and commercial clients, including consultation, system design, installation, maintenance, and battery storage with monitoring. The company carries out electrotechnical work limited to the installation of electrical high-current systems and equipment up to 1500 volts and 150 kilowatts, and the installation of lightning protection systems.

Helios Swiss Solution AG

Since 1994 · 1–10 empl.·5.0(9)

E-Q GmbH

Since 2020 · 11–20 empl.

E-Q GmbH provides electrical installations and network/data cabling for residential and commercial properties. The company implements smart-home systems (KNX, Loxone), plans and installs photovoltaic systems, and supplies telematics/VoIP and unified-communications services.

PVT-Schweiz GmbH

Since 2008 · 1–10 empl.·5.0(2)

The core activity of PVT Schweiz is the planning, installation and marketing of photovoltaic systems for private and commercial customers in Switzerland.

Alpen Solar GmbH

Since 2025 · 1–10 empl.

Alpen Solar GmbH plans, installs and maintains photovoltaic and solar systems for private and business customers. The company also handles permit applications, approvals, commissioning, acceptance checks, and storage and backup power solutions.

Kopernikus Energy KLG

Since 2025 · 1–10 empl.

Kopernikus Energy KLG plans and implements photovoltaic systems and energy projects for building and open-area sites. The company also provides consulting, planning, execution, and after-sales service related to heat pumps and energy-efficient renovations.