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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumbing & Building ServicesGrand-LancyThermoptimum SA
Thermoptimum SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Thermoptimum SA is the distribution, maintenance and repair of equipment and systems for heating, cooling and renewable energy, particularly: heat pumps, solar collectors, boilers, burners, refrigeration machines and control systems. The company also offers services such as 24/7 emergency repair, maintenance and upkeep, consulting and expertise, as well as installation and commissioning of equipment and systems. The company focuses on the needs of private individuals and professional customers in Switzerland, particularly in the Romandy region.

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Products & services

Industry:Plumbing & Building Services
✓ Offered
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4.0/5

Thermoptimum SA

7
Maintenance and breakdown service for burners, boilers, heat pumps and solar installations
Fixed-price maintenance and breakdown service for burners, boilers, heat pumps and solar installations; 24/7 service, maintenance contracts and documented servicing.
Supply and servicing of thermal equipment
Supply and servicing of heat pumps, solar tubes, boilers and burners for private customers and professionals in heating and cooling.
Implementation of building automation
Implementation of building automation for integrated HVAC management and monitoring of small, medium and large installations.
Maintenance and inspection of burners
Cleaning, checking burner operation and the combustion controller, setting the heat output and measuring harmful emissions.
Maintenance and inspection of boilers
Inspection of the boiler, the circulation and charging pumps, the electrical panel and the control and safety devices.
Maintenance and inspection of heat pumps
Gas inspection, leak detection, inspection of the electrical section and inspection of the air/water or ground/water components.
Maintenance and inspection of thermal solar installations
Check of the purge, addition of heat transfer fluid if necessary, check of the freeze temperature, leak detection and inspection of the sensor and control unit.
Trust & reputation

ranQ Trust Score of Thermoptimum SA: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 96% · As of October 2026

Thermoptimum SA scores 58.8 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.49.624%
  • 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%
Thermoptimum SA 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%
Thermoptimum SA 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%
Thermoptimum SA scores 0.0 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 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Thermoptimum SA reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 3.8 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
3.8
of 5

Aggregated from 16 reviews across all connected sources

Sources
GGoogle3.816
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Chemin de Grange-Collomb 12
1212 Grand-Lancy

At a glance

Legal form
Corporation
UID
CHE-115.133.314
Founded
2009 · 17 years
Last commercial register change
April 1, 2026
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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