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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryCrafts & TradesAir conditioningAppenzell EnggenhüttenLetra AG
Letra AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Letra AG plans and delivers building services solutions for heating, cooling, water and air. Its activities include installing heating, ventilation and air-conditioning systems and plumbing, as well as maintaining, repairing and upgrading existing installations.

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Presence

Service area

Offering

Products & services

Industry:Air conditioningHeating installer
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Letra AG

Plumber
✓ Offered9
Heating systems
Classic and alternative heating systems, planning and construction of custom solutions, service packages for operation, repair, optimisation and extension of existing systems.
Heat pump systems
Planning, installation and commissioning of heat pump systems with FWS performance certificate and alignment to high energy efficiency.
Solar and geothermal
Solar and geothermal solutions for using heat sources for energy-efficient building services.
Ventilation systems
Ventilation systems for residential and office spaces, including design, maintenance, hygiene, air conditioning and mechanical cleaning of air duct systems.
Comfort ventilation
Comfort ventilation and controlled home ventilation with heat recovery for air exchange and energy savings in apartment and office.
Air conditioning
Air conditioning of rooms to protect the building structure and for a healthy living and working environment.
Water supply and distribution
Protection of the house against water damage as well as transport and distribution of water within the home, including planning of water use in the kitchen and bathroom.
Water treatment and descaling
Analysis and suitable solutions for hard water, including handling of limescale deposits in pipes and water installations.
Bathroom and kitchen building services
Building services for bathrooms and kitchens, tailored to needs and design and implemented in the use of water within the home.
Trust & reputation

ranQ Trust Score of Letra AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of November 2026

Without public customer reviews the score stays capped.

Letra AG 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%
Letra AG 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%
Letra 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%
Letra AG scores 6.6 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 35.6.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Letra AG 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 November 2026.

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

Knowledge

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Comparisons

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Location

Steinerstrasse 12
9050 Appenzell Enggenhütten

At a glance

Legal form
Corporation
UID
CHE-105.912.423
Founded
1983 · 43 years
Last commercial register change
August 29, 2024
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • AISchlatt-Haslen
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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