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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryCrafts & TradesSpecialized Construction InstallationsBülachRotondo U. Siegrist GmbH
Rotondo U. Siegrist GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Rotondo U. Siegrist GmbH is a climate-technology company that plans, installs and services air-conditioning, heat-pump and ventilation systems. The company supplies solutions for residential climate control, wine-cellar and medical/pharmacy cooling and provides maintenance, disinfection and online quotation services.

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Products & services

Industry:Specialized Construction Installations
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3.9/5

Rotondo U. Siegrist GmbH

✓ Offered6
Air conditioning systems
Air conditioning systems for homes and apartments, with installation and advice on suitable units and indoor/outdoor unit configurations.
Heat pumps
Heat pumps for heating replacements, with advice on replacement options and sizing for existing heating systems.
Ventilation systems
Ventilation systems and comfort ventilation for buildings, with sizing based on room size, wet rooms and unit location.
Heat pump water heaters
Heat pump water heaters for domestic hot water, with boiler size and placement captured during quotation requests.
Emergency heaters (Volcano)
Portable emergency heaters with 8 kW or 17 kW output, used as a temporary solution until the heating system is repaired.
Professional air purifier
Professional air purifier for filtering viruses, bacteria and dust from indoor air, with HEPA14 filtration and use in practice rooms or beauty studios.
Trust & reputation

ranQ Trust Score of Rotondo U. Siegrist GmbH: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of October 2026

Rotondo U. Siegrist GmbH scores 59.3 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
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.75.024%
  • 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.40.910%
  • 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.35.08%
Rotondo U. Siegrist GmbH scores 83.0 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%
Rotondo U. Siegrist 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%
Rotondo U. Siegrist GmbH scores 1.4 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 35.1.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Rotondo U. Siegrist GmbH reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 4 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 4 reviews across all connected sources

Sources
GGoogle54
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Tiefengasse 4
8180 Bülach
Opening hours
Mon
08:00 - 12:00, 13:00 - 17:00
Tue
08:00 - 12:00, 13:00 - 17:00
Wed
08:00 - 12:00, 13:00 - 17:00
Thu
08:00 - 12:00, 13:00 - 17:00
Fri
08:00 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-102.752.011
Founded
1995 · 31 years
Last commercial register change
October 17, 2025
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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