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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryCrafts & TradesSpecialized Construction InstallationsAarauRetas Schema AG
Retas Schema AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Retas Schema AG is the planning, execution and commissioning of control and regulation technology for heating, ventilation and air conditioning (HVAC) systems as well as building automation. This includes in particular: creation of electrical schematics and software, delivery and installation of control and field devices as well as switchgear, commissioning and troubleshooting of systems, consulting and execution of projects in the field of HVAC and building automation. The company offers its services primarily for medium-sized and smaller projects in the Swiss Plateau region.

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Products & services

Industry:Specialized Construction Installations
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Retas Schema AG

✓ Offered7
Control and regulation technology
Consulting and execution in control and regulation for HVAC systems (HLK), from quotation to electrical schematics, software and control cabinet through to commissioning.
Electrical schematics
Electrical schematics for HVAC systems (HLK) using the CAE33, ProPlan and MacSchema systems, including logical structure for swift on-site implementation of the wiring diagrams.
Software
Support of systems with AS1000 and Saia, software adaptations and web-controlled external access to the reference models.
Control and field devices
Supply of control and field devices for installations as a reseller, exactly matched to the respective project.
Control cabinets
Procurement and configuration of control cabinets for the installation’s electrical and electronic components at favourable terms.
Commissioning of systems
Commissioning of controllers and software, coordination of the installation, and checking of all field devices and functions.
Troubleshooting for existing systems
Quick help with faults in existing systems, including older systems with Polygyr controllers from Landis+Gyr or Klimo controllers from SCS.
Trust & reputation

ranQ Trust Score of Retas Schema AG: 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.

Retas Schema 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%
Retas Schema 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%
Retas Schema 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%
Retas Schema AG scores 1.7 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 35.1.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Retas Schema 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 October 2026.

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

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Location

Tellistrasse 116
5000 Aarau
Opening hours
Mon
08:00 - 12:00, 13:30 - 17:00
Tue
08:00 - 12:00, 13:30 - 17:00
Wed
08:00 - 12:00, 13:30 - 17:00
Thu
08:00 - 12:00, 13:30 - 17:00
Fri
08:00 - 12:00, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.379.327
Founded
1991 · 35 years
Last commercial register change
November 25, 2021
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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