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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesOberkulmGassmann Service AG
Gassmann Service AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Gassmann Service AG is the installation, maintenance and repair of heating systems, particularly heat pumps, heat pump boilers, oil and gas heating systems, as well as water softening systems and air conditioning units.

AI-generated
Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered8
Heating service
Service work, maintenance work, 24-hour on-call duty and descaling of boilers for heating systems; including regular inspections, troubleshooting and a maintenance contract.
New heating installations
New installations of heating systems for single-family homes, commercial and industrial premises; including consultation, design, building permit submission, installation and commissioning.
Heat pumps
Planning and installation of heat pump systems for new installations; listed as reference projects and part of the offer.
Oil-fired heating systems
New installations of oil-fired heating systems as well as associated service and reference installations.
Gas heating systems
New installations of gas heating systems as well as service for existing systems.
Water softening systems
New installations of water softening systems and installation of systems on the customer’s behalf.
Heat pump boilers
New installations and reference installations for heat pump boilers; consultation and installation by the service company.
Air-conditioning units
Installation of air-conditioning unit systems on the customer’s behalf and advice on suitable solutions.
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4.5/5

Gassmann Service AG

Trust & reputation

ranQ Trust Score of Gassmann Service AG: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 96% · As of October 2026

Gassmann Service AG scores 87.9 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.86.924%
  • 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.84.710%
  • 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.95.08%
Gassmann Service AG scores 85.5 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.55.07%
Gassmann Service AG scores 85.0 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).85.022%
Gassmann Service AG scores 62.9 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 35.62.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Gassmann Service 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 27 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 27 reviews across all connected sources

Sources
GGoogle4.927
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Hauptstrasse 18
5727 Oberkulm
Opening hours
Mon
07:30 - 17:00
Tue
07:30 - 17:00
Wed
07:30 - 17:00
Thu
07:30 - 17:00
Fri
07:30 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-115.322.795
Founded
2010 · 16 years
Last commercial register change
April 19, 2022
Employees
1 to 10
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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