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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesFrauenfeldEdwin Keller + Partner AG
Edwin Keller + Partner AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Edwin Keller + Partner AG is an independent engineering firm for building services that provides neutral consultancy and planning for sanitary systems, heating, ventilation, air conditioning/cooling, specialist coordination and property drainage.

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Offering

Products & services

Industry:Plumbing & Building Services
✓ Offered
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4.1/5

Edwin Keller + Partner AG

7
Building services planning
Neutral advice and planning of building services from the concept idea to handover, with technical and economic optimisation in the early project phases.
Plumbing engineering
Plumbing engineering for new builds, conversions and renovations, including sanitary installations, site drainage and pipework planning.
Heating system planning
Planning of heating systems within building services, in particular as part of overall design, project coordination and energy-optimised solutions.
Ventilation planning
Planning of ventilation systems for building services projects, aligned to room climate, comfort and technical requirements.
Refrigeration and air-conditioning planning
Planning of air-conditioning cooling and refrigeration systems as part of building services, also in conjunction with heating, ventilation and plumbing.
Specialist coordination of building services
Specialist coordination of all building services across the trades involved, from design development to execution.
Site drainage
Planning of site drainage as well as the internal and external main drainage lines for buildings and areas.
Trust & reputation

ranQ Trust Score of Edwin Keller + Partner AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

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Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Edwin Keller + Partner AG has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
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CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Edwin Keller + Partner AG scores 89.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
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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.70.07%
Edwin Keller + Partner AG scores 83.3 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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%
Edwin Keller + Partner AG scores 25.7 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
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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 35.25.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Edwin Keller + Partner AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, 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.

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Location

Algisserstrasse 8
8500 Frauenfeld

At a glance

Legal form
Corporation
UID
CHE-101.255.655
Founded
1989 · 37 years
Last commercial register change
January 14, 2021
Employees
11 to 20
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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