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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringFrümsenEnergietechnik Lehner
Energietechnik Lehner Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Energietechnik Lehner is consulting, planning and implementing energy-efficient solutions for buildings, particularly in the areas of building biology, thermography, air tightness testing, mold and electrosmog testing, cellulose insulation, energy consulting and ventilation. The company also offers services such as creating energy certificates, conducting thermography investigations and advising on the renovation and modernization of buildings.

AI-generated
Offering

Products & services

Industry:Technical Consulting & Engineering
✓ Offered9
Energy consulting
Measures, certifications and subsidies; building refurbishment with a concept, including initial assessment, GEAK, report on required actions, measures, costs and funding options.
Thermography
Thermographic surveying and assessment of the building envelope to locate thermal bridges, air-leak points and damage, as a basis for refurbishment and quality control.
Air-tightness test
Testing the air tightness of the building envelope for new buildings, Minergie-P houses, existing buildings and before conversions or renovations, including leak detection and certificate.
Building biology
Building-biology consultation, home inspections and selection of environmentally friendly building materials; plus support for new builds and extensions, renovations and electrosmog investigations.
Mould investigation and remediation
Measurement of air and building-material moisture, surface temperature and sample analysis in the laboratory; clarification of causes, building envelope and user behaviour for lasting remediation recommendations.
Electrosmog measurement and advice
Measurement of low-frequency and high-frequency electromagnetic fields as well as static fields; indications for reducing, shielding and optimizing sleeping and living areas.
Cellulose insulation
Blown-in insulation with Isofloc for roofs, walls, ceilings, timber and lightweight constructions as well as for renovations and new builds; seamless insulation with good summer thermal protection.
Ventilation
Controlled residential ventilation with heat recovery, including planning, advice, execution, maintenance, service and controls for new builds and Minergie buildings.
PV systems
Implementation of PV systems for solar power generation; described on the website as a separate service area with reference to project implementation.
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4.1/5

Energietechnik Lehner

Trust & reputation

ranQ Trust Score of Energietechnik Lehner: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Energietechnik Lehner 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%
Energietechnik Lehner scores 78.5 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%
Energietechnik Lehner scores 83.3 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).83.322%
Energietechnik Lehner scores 20.0 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 35.20.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Energietechnik Lehner 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

Tina 4
9467 Frümsen

At a glance

Legal form
Sole proprietorship
UID
CHE-116.192.029
Founded
2010 · 16 years
Last commercial register change
November 16, 2010
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.
67.0
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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