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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesEngineerChurAmstein + Walthert AG
Amstein + Walthert AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

Amstein + Walthert AG provides engineering and consulting services for building services and related disciplines. Its work includes heating, ventilation, air conditioning, cooling and plumbing, electrical engineering and building automation, as well as advice on energy, environmental and sustainability matters throughout the life cycle of buildings and sites.

AI-generated
Presence

Service area

Offering

Products & services

Industry:Engineer
✓ Offered10
Integrated building services design
Integral planning for heating, ventilation, air conditioning, refrigeration and sanitary systems as well as electrical and building automation; support from the early project phase through implementation and handover.
Sustainable planning and building concepts
Solutions for ecological aspects in construction, sustainable planning and building, energy concepts as well as development, operation and maintenance concepts for buildings and sites.
Energy and decarbonisation concepts
Feasibility checks, variant comparisons and implementation for replacement of heating systems, photovoltaics, e-mobility and other decarbonisation measures, including site assessment and GEAK-Plus consulting.
Ventilation and air-conditioning design
Design of compact ventilation and air-conditioning systems with heat recovery, system sizing and consideration of operation and maintenance to reduce energy consumption.
Heating engineering
Tailor-made heat engineering for new builds and renovations; design of heat distribution, hydraulic optimisation and solutions for room and comfort heating.
Sanitary engineering
Site-specific solutions for water and gas supply as well as building drainage and disposal, focused on efficient and sustainable design and drinking-water hygiene.
Refrigeration engineering for commercial and industry
Design of refrigeration systems for storage, gastronomy, food production and the chemical industry; energy-efficient system concepts using natural refrigerants and waste-heat recovery.
Large heat pumps
Planning and integration of industrial heat pumps for building heating, processes, domestic hot water and district heating, often with natural refrigerants and anergy networks.
Thermal networks
Conceptualisation, design and optimisation of district heating and district cooling networks; potential assessments, feasibility studies, cost-effectiveness calculations and support through to operation.
Fire protection design
Planning and coordination of fire protection measures for buildings and facilities as part of integrated construction and building services engineering design.
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4.1/5

Amstein + Walthert AG

Trust & reputation

ranQ Trust Score of Amstein + Walthert 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.

Amstein + Walthert 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%
Amstein + Walthert AG scores 84.1 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.70.07%
Amstein + Walthert AG 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%
Amstein + Walthert AG scores 100.0 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 35.100.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Amstein + Walthert 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.

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Location

Gürtelstrasse 11
7000 Chur

At a glance

Legal form
Branch
UID
CHE-433.927.963
Founded
2006 · 20 years
Last commercial register change
March 10, 2017
Employees
11 to 20

Active in 1 of 26 cantons

  • GRGrisons
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.
76.0
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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