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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumberKreuzlingenZahn + Co. AG
Zahn + Co. AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Zahn + Co. AG delivers building services engineering, providing planning, installation, maintenance and refurbishment of heating, cooling, ventilation and sanitary systems. Services include heating/cooling, ventilation/air conditioning, sanitary installations, industrial systems and technical service.

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Service area

Offering

Products & services

Industry:Plumber
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Zahn + Co. AG

✓ Offered6
Building Services Engineering
Building services engineering for new builds and refurbishments, from advice and planning to installation and delivery of heating, ventilation, air conditioning and sanitary systems.
Service and Maintenance
Service for building technology systems, including maintenance, heating service, heating checks, fault rectification and upkeep for ongoing operation.
Heating Renovation and Replacement
Heating renovation, heating replacement and modernization of existing systems, including system checks and planning of on-site implementation.
Heating and Cooling
Advice, planning and installation of heating and cooling systems for new builds and refurbishments, including solutions for different building types.
Ventilation and Air Conditioning
Advice, planning and installation of ventilation and air conditioning systems for commercial premises, apartments, service companies and institutions.
Sanitary Installation
Advice, planning, installation and maintenance of sanitary systems for new builds and refurbishments, with a focus on reliable long-term operation.
Trust & reputation

ranQ Trust Score of Zahn + Co. AG: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of November 2026

Zahn + Co. AG scores 71.7 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.65.024%
  • 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.82.910%
  • 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.78.08%
Zahn + Co. 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%
Zahn + Co. AG scores 86.7 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).86.722%
Zahn + Co. AG scores 100.0 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 35.100.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Zahn + Co. AG reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.3 out of 5 stars from 25 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of November 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.3
of 5

Aggregated from 25 reviews across all connected sources

Sources
GGoogle4.325
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Comparisons

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Location

Zelgstrasse 5
8280 Kreuzlingen
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
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-101.727.051
Founded
1987 · 39 years
Last commercial register change
April 21, 2026
Employees
21 to 50

Active in 1 of 26 cantons

  • TGThurgau
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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