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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureSite PreparationThune-therm ag
e-therm ag Logo
Verified· 3 sourcesTrust Score
Summary

About the company

e-therm ag is a construction services company specialising in the drilling and installation of ground-source (geothermal) probes. The company performs boreholes using airlift or circulation methods (to depths beyond 400 m), installs PE probes, lays connection lines and heat-pump connections, carries out bentonite backfilling and electronic testing with documentation in accordance with SIA 384/6.

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Products & services

Industry:Site Preparation
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e-therm ag

Ground heat exchanger borehole systems
Ground heat exchanger borehole systems with drilling to depths of over 400 m, executed as Airlift or flush drilling, installation of the probe, connecting lines to the building and connection to the heat pump.
Advisory services for ground heat exchanger borehole systems
Advisory services for the design and installation of ground heat exchanger borehole systems for planning and architectural offices, installers and clients; including assessment of small projects and larger earth-borefield systems.
Drilling process for ground heat exchanger boreholes
Drilling process using Airlift or flush drilling methods, setting the ground heat exchanger probe, bentonite backfilling, electronic testing in accordance with SIA 384/6 and collection of drill samples.
Quality testing and documentation
Electronic testing of the ground heat exchanger probe and the backfill according to SIA 384/6, presentation of the results in a factsheet and quality assurance through certifications and further training.
Trust & reputation

ranQ Trust Score of e-therm ag: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

e-therm ag scores 71.2 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.71.224%
  • 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.72.110%
  • 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.70.08%
e-therm ag scores 92.5 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.70.07%
e-therm 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%
e-therm ag scores 80.0 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 35.80.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

e-therm ag reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.5 out of 5 stars from 16 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
4.5
of 5

Aggregated from 16 reviews across all connected sources

Sources
GGoogle4.516
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Frutigenstrasse 37
3600 Thun
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 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-102.210.916
Founded
1990 · 36 years
Last commercial register change
September 4, 2026
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.100.03%
    • Full methodology

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