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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding services engineerArconcielERENA Sàrl
ERENA Sàrl Logo
Verified· 2 sourcesTrust Score
Summary

About the company

ERENA Sàrl provides advice and planning for energy and building systems in new construction and renovation projects. Its services include building energy assessments, energy concepts, and the planning of heating, ventilation, air conditioning, electrical and sanitary installations.

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Service area

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Products & services

Industry:Building services engineerEnergy consulting
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ERENA Sàrl

✓ Offered7
Energy and Building Services Consulting
Energy and building services consulting with energy analysis, CECB assessment, sustainable development concepts, project support and selection of technical solutions.
Heating, Ventilation, Air Conditioning, Electrical and Sanitary Planning
Planning of heating, ventilation, air conditioning, electrical and sanitary systems for new buildings, renovations and change-of-use projects.
Energy Analysis and CECB Energy Consulting
Building energy analysis, CECB expertise, thermography and scenario assessment with cost estimates for renovations or change-of-use projects.
Building Concepts for New Construction and Renovation
Building concepts for new construction and renovation with thermal calculations, overall strategy, Minergie goals and positive-energy building targets.
Building Automation and MCR Automation
Home automation and MCR automation for technical building functions in combination with energy and building services engineering.
Building Envelope and Comfort Planning
Planning of the building envelope and comfort in relation to energy efficiency, technical installations and construction requirements.
Project Coordination
Coordination of work and stakeholders in building and technical projects, including collaboration with architects and partners.
Trust & reputation

ranQ Trust Score of ERENA Sàrl

Trust Score

No score yet

x

A published score requires a data basis of at least 50% and data from at least two criteria groups other than identity. Missing evidence: Review quality, Review volume, Review recency, Media authority

Data basis 54% · As of November 2026

ERENA Sàrl 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.
x
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%
ERENA Sàrl scores 83.0 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%
ERENA Sàrl 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%
ERENA Sàrl 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%

The data basis is 54%, below the threshold at which ranQ publishes a score. Evidence is missing for: Review quality, Review volume, Review recency, Media authority. As of November 2026.

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

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Location

Sur le Moulin 58
1732 Arconciel

At a glance

Legal form
Limited Liability Company
UID
CHE-105.087.782
Founded
1999 · 27 years
Last commercial register change
January 7, 2021
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • FRBois-d'Amont
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.
88.0
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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