Hertner

What Hertner does

Hertner GmbH is a German full-service technical building equipment (TGA / Gebäudetechnik) provider founded in 1991 and headquartered in Heilbronn, with a branch office in Leipzig and wholly-owned operating subsidiaries in Sibiu (Romania) and Sofia (Bulgaria). The company is privately held as a GmbH and has operated as part of the Builtech Group since 2023, led by Managing Director Patrick Bezner. Hertner delivers a 360° TGA portfolio across eight service disciplines — heating (Heizung & Wärme), ventilation (Lüftung), sanitary (Sanitär), refrigeration and air conditioning (Kälte & Klima), sprinkler and fire protection, electrical (Elektro, including KNX/EIB bus systems and E-Mobility charging), measurement/control/regulation and building automation (MSR / Gebäudeleittechnik), and energy efficiency including PV consulting. Underlying technology is standards-based building automation — DDC systems, PLC, control room, measurement, and remote-control infrastructure — rather than proprietary AI platforms.

The business model is B2B project and service work, with no publicly disclosed pricing; customers contact via phone and dedicated email channels ([email protected], [email protected], [email protected], [email protected]). GTM is sales-led, combining direct field sales to industrial and commercial customers with regional offices, digital demand generation (Google Ads plus service-specific website pages), and brand presence on Instagram and LinkedIn. Hertner serves primary segments in industry (Industrie) and commercial/economic (Wirtschaft) customers, with a secondary residential (Wohnungsbau) segment; pain points addressed are complex multi-trade building technology projects requiring a single-source provider and ongoing service/maintenance of installed systems. The company operates with 170+ trained specialist tradespeople (Facharbeiter) holding long-tenured ISO 9001 certification since 1997, VdS sprinkler approval, PQ-VOB prequalification, and additional trade credentials (WHG, VDKF, Handwerksrolle), creating a regulated, certified trade-services profile.

Name

Hertner

Legal name

Hertner GmbH

Website

https://hertner.de

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

101–250 employees

Short description

Hertner GmbH is a German full-service technical building equipment (TGA) contractor delivering heating, ventilation, sanitary, HVAC, fire protection, electrical, building automation, and energy-efficiency services to industrial, commercial, and residential customers across Germany, Romania, and Bulgaria as part of Builtech Group.

Ownership category

akta.pro rank

Product category

Building Technology Services

NAICS

Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (3334), Heating Equipment (except Warm Air Furnaces) Manufacturing (333414)

SIC

Refrigeration & Service Industry Machinery (3580), Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564), Industrial Process Furnaces & Ovens (3567)

akta.pro primary industry

HVAC & Refrigeration Contracting (IMAFALAB)

akta.pro secondary industries

Hard Services (MEP/HVAC, Electrical, Plumbing) (BPABAAAA), Compressor, Condenser & Evaporator Service (HSAOAJAG)

Keywords

• Building technology services
• Technical building equipment
• HVAC installation
• Fire protection systems
• Energy efficiency consulting

Headquarters

HQ city

Heilbronn

HQ country

Germany

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Building Technology Services (TGA-Dienstleistungen): Full-service building technology provider offering design, planning, installation, and maintenance services across all TGA trades. Revenue generated through project-based work and ongoing service contracts for industrial, commercial, and residential customers.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

Hertner GmbH is a full-service Technical Building Equipment (TGA / Gebäudetechnik) provider covering eight integrated service lines: heating, ventilation, sanitary, refrigeration and air conditioning, sprinkler/fire protection, electrical, MSR (measurement, control, regulation / building automation), and energy efficiency. The company delivers the complete lifecycle from consulting and planning through installation and execution to ongoing service and maintenance, serving industrial, commercial, and residential customers across Germany and internationally through subsidiaries in Romania and Bulgaria.

Product overview

Hertner is a Technical Building Equipment (TGA) company operating as part of the Builtech Group, offering a comprehensive, full-service portfolio spanning eight core service areas: Heizung & Wärme (heating), Lüftung (ventilation), Sanitär (sanitary/plumbing), Kälte & Klima (refrigeration/AC), Sprinkler (fire protection), Elektro (electrical), MSR (building automation/controls), and Energieeffizienz (energy efficiency including PV). These eight service lines form a unified 360° TGA offering — from initial consulting and planning through execution and full lifecycle maintenance — covering the complete spectrum of building technology for properties of all sizes, from residential to industrial, across Germany with international operations in Romania and Bulgaria.

Differentiator

Problem solved

Functional benefit

Products and services

• Heizung & Wärme (Heating & Warmth) Heating system installation and maintenance covering all energy carriers, district heating, thermal building core activation, heat recovery, cogeneration, heat pumps, solar thermal, geothermal, steam boiler, and heat storage systems, for industrial, commercial, and residential customers.
• Lüftung (Ventilation) HVAC (RLT) ventilation systems providing fresh air and climate control for buildings of all sizes, including units with humidification/dehumidification, air heating/cooling, and heat/cold recovery.
• Sanitär (Sanitary) Sanitary installation and maintenance services including water treatment systems for softening and demineralization, and hydrant systems for fire protection.
• Kälte & Klima (Refrigeration & Air Conditioning) Cooling and air conditioning solutions including climate split, multi-split, chilled water generation, absorbers, and energy recovery systems for industrial and production facilities.
• Sprinkler (Fire Protection) Comprehensive fire protection systems including sprinkler installations, fire extinguishing systems, alarm devices, room monitoring, and facility monitoring; Hertner is a VdS-approved operating company for installation and maintenance.
• Elektro (Electrical) Full-spectrum electrical installation services covering low and medium voltage systems, safety power supply and compensation systems, UPS and generator systems, cable networks, switchgear, KNX/EIB bus systems, lighting, emergency lighting, lightning protection, fire alarm systems, voice alarm systems, network/IT cabling (copper/fiber including splicing), PV systems, and E-Mobility charging infrastructure.
• MSR (Measurement, Control & Regulation / Building Automation) Building automation and control systems that optimize the interaction of heating, ventilation, air conditioning, lighting, blinds, and other systems for maximum comfort and energy efficiency. Services include building management technology, DDC systems, process technology, PLC technology, control room technology, measurement technology, and remote control systems.
• Energieeffizienz (Energy Efficiency) Energy consulting for residential, commercial, and industrial buildings covering energy-efficient building retrofit and new construction planning, including photovoltaic and solar energy consulting, under the 360° TGA umbrella.

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Four partnerships are on record, tiered core and minor.

• Builtech GroupcoreStrategic or Co-development PartnerHertner is part of Builtech, an innovative network for all TGA trades in the German-speaking region and Nordics. Builtech Group provides international networking while maintaining local expertise. Customers benefit from combined know-how and best local contacts.
• HERTNER Building Technology S.R.L. (Romania)coreStrategic or Co-development PartnerSubsidiary company in Sibiu, Romania enabling international operations and serving customers in the Romanian market.
• Hertner Building Technology EOOD (Bulgaria)coreStrategic or Co-development PartnerSubsidiary company in Sofia, Bulgaria enabling international operations and serving customers in the Bulgarian market.
• VolkertGSRminorStrategic or Co-development PartnerRelated company within Builtech Group mentioned in social media posts about joint events and employee activities.

Scale indicators4 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• Sodexo Germany: Global facility-services incumbent with technical building management, energy management and HVAC offerings in Germany; comparable customer base and delivery model to Hertner but broader service mix and international parent.
• Dussmann Group: German facility-management and technical building services group combining hard services (HVAC, electrical, fire protection) with cleaning and security; overlaps with Hertner on technical trades but operates more broadly across FM.
• Gegenbauer Services: Berlin-based building and facility-services provider delivering technical building management, HVAC and energy services across Germany; competes with Hertner on multi-trade technical services for commercial properties.
• ENGIE Deutschland: Major energy and facility-services incumbent in Germany operating across HVAC, refrigeration, energy efficiency and integrated facility management; overlaps with Hertner on heating, cooling and energy retrofit but at much larger, multi-segment scale.
• Kötter Group: German family-run facility services group providing technical building services, cleaning and security; overlaps with Hertner on technical trades for commercial real estate and industrial customers in Germany.
• WISAG: Large German facility-services group providing technical building management, HVAC, electrical and energy services to industrial and commercial clients; comparable multi-trade service model and customer segments to Hertner, but at significantly larger scale.

Direct peers

• SPIE GmbH: Germany's largest multi-disciplinary technical building services (TGA) provider covering HVAC, electrical, plumbing, fire protection and automation for commercial and industrial customers — directly comparable in scope and customer base to Hertner's eight-trade portfolio.
• Sauter-Cumulus GmbH: German building automation and HVAC services company combining MSR, GLT, HVAC and energy-efficiency services for industrial and commercial clients; closest functional comparator to Hertner's MSR/automation layer.
• RGM Holding GmbH: Mid-sized German TGA/building-services contractor operating nationally with heating, ventilation, sanitary, cooling, electrical and automation trades for commercial and industrial customers; closest mid-market size and multi-trade model to Hertner.
• Caverion Deutschland: Northern European TGA specialist delivering building technology, HVAC, plumbing, electrical and life-safety services across industrial and commercial real estate in Germany; close functional and customer overlap with Hertner.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/hertner-gebaeudetechnik
• Instagraminstagram.com/hertner_volkertgsr

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Hertner