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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentSolar & PhotovoltaicsKaltbrunnSelm Heizsysteme AG
Selm Heizsysteme AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Selm Heizsysteme AG is the planning, installation and maintenance of heating systems, particularly environmentally friendly and renewable energy systems such as heat pumps, solar systems, wood heating systems, oil heating systems and gas heating systems. The company also offers services such as heating replacement, repairs and maintenance.

AI-generated
Offering

Products & services

Industry:Solar & Photovoltaics
✓ Offered11
Heating systems
Heat pumps, oil heating, gas heating, wood heating and solar systems for modern and environmentally friendly heating systems; including heat generation, heat distribution and integration with comfort ventilation.
Consulting
Consulting on heat generation, heat distribution, heat pumps, solar systems and comfort ventilation; for new builds, conversions and refurbishments, including support for switching to fossil-free heating systems.
Planning
Planning of heating and ventilation projects with IT and CAD programs; preparation of funding documents and building applications for heating refurbishments.
Installation
Installation of heating systems with properly trained installation personnel; prefabricated components shorten installation time on site.
Service
Service and troubleshooting for heating systems; available in winter in the evenings and at weekends, with rapid response to upcoming fault cases.
Heating system replacement
Heating system replacement with consulting, planning, installation and service; support for switching to renewable energy and for renewing existing heating systems.
Solar systems
Thermal solar systems with tube collectors and flat-plate collectors for domestic hot water heating, heating support and integration in single- and multi-family houses.
Heat pumps
Heat pumps for using air, ground and water; suitable for new builds and as a heating system for renewable heat generation with geothermal probes.
Oil heating
Oil-fired heating systems as heating systems for buildings, offered alongside other heating solutions such as gas, wood and heat pump systems.
Gas heating
Gas heating systems as heating systems for buildings, provided as part of the product range for modern heating installations.
Wood heating
Wood heating systems as heating systems for buildings, offered together with heat pumps, oil, gas and solar systems.
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4.5/5

Selm Heizsysteme AG

Trust & reputation

ranQ Trust Score of Selm Heizsysteme AG: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 96% · As of October 2026

Selm Heizsysteme AG scores 86.5 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.85.324%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.78.610%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.100.08%
Selm Heizsysteme AG scores 92.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.82.07%
Selm Heizsysteme AG scores 83.3 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).83.322%
Selm Heizsysteme AG scores 60.0 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.60.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Selm Heizsysteme AG reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 4.9 out of 5 stars from 21 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.9
of 5

Aggregated from 21 reviews across all connected sources

Sources
GGoogle4.921
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Comparisons

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Location

Fischhausenstrasse 5
8722 Kaltbrunn
Opening hours
Mon
07:30 - 12:00, 13:00 - 17:00
Tue
07:30 - 12:00, 13:00 - 17:00
Wed
07:30 - 12:00, 13:00 - 17:00
Thu
07:30 - 12:00, 13:00 - 17:00
Fri
07:30 - 12:00, 13:00 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.287.151
Founded
1998 · 28 years
Last commercial register change
June 30, 2026
Employees
21 to 50
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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