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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureBuilding MaintenanceOssingenLang Wärmetechnik GmbH
Lang Wärmetechnik GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Lang Wärmetechnik GmbH is the maintenance and repair of heating systems, in particular the inspection and maintenance of combustion systems, burners (oil and gas) as well as the upkeep of heating systems, including the replacement of pumps and radiator valves.

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Products & services

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4.0/5

Lang Wärmetechnik GmbH

✓ Offered
5
Maintenance of oil and gas burners
Regular maintenance, thorough cleaning, filter replacement and functional testing of oil heating systems for long-term, reliable operation.
Combustion inspection
Measurement and adjustment of the burner for clean, efficient and compliant operation with fewer emissions.
Breakdown service call
Rapid help for heating failures, including diagnosing the cause, repairing the fault and putting the system back into operation, even in the evening or at the weekend.
System optimisation
Analysis of the current condition and optimisation of existing heating systems for more efficient operation, lower energy consumption and reduced costs.
Customer consulting
Consulting on new heating solutions and existing systems, with a transparent assessment, the right solution and clear explanation for the property.
Trust & reputation

ranQ Trust Score of Lang Wärmetechnik GmbH: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

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Data basis 96% · As of October 2026

Lang Wärmetechnik GmbH scores 65.0 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
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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.73.124%
  • 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.35.310%
  • 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.78.08%
Lang Wärmetechnik GmbH scores 72.3 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.75.012%
  • 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%
Lang Wärmetechnik GmbH scores 85.0 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).85.022%
Lang Wärmetechnik GmbH scores 40.0 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 35.40.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Lang Wärmetechnik GmbH reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 3 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
5
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle53
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Underem Berg 3
8475 Ossingen
Opening hours
Mon
24h
Tue
24h
Wed
24h
Thu
24h
Fri
24h
Sat
24h
Sun
24h

At a glance

Legal form
Limited Liability Company
UID
CHE-398.624.792
Founded
2019 · 7 years
Last commercial register change
December 20, 2019
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.
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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