What Diehl GmbH - Technische Gebäudesysteme does

Diehl GmbH - Technische Gebäudesysteme, operating as Diehl Apleona Wolfferts, is a regional full-service technical building equipment (TGA — Technische Gebäudeausrüstung) provider headquartered in Baumholder, Rhineland-Palatinate, Germany. Founded in 1933 by Wilhelm Diehl as a heating construction business, the company has expanded across nine decades into a multi-trade integrator covering heating (including heat pumps, BHKW/CHP, fuel cells, solar thermal), ventilation and air conditioning, refrigeration, sanitary/media installations, MSR (measurement, control, regulation) and electrical building automation, photovoltaics with storage, and swimming pool and spa technology. Service and maintenance, energy consulting, TGA planning, and project management round out a full value chain delivered under a single-contact model.

The company operates 8 branch offices across Rhineland-Palatinate, Hesse, and Thuringia (Baumholder, Kaiserslautern, Trier, Ludwigshafen, Landau, Bad Sobernheim, Wiesbaden, Erfurt) with approximately 570-600 employees, including ~75 apprentices, and a proprietary training academy (Diehl Akademie) opened in Baumholder in July 2026. It serves four primary customer segments: industrial enterprises, public sector/municipal clients, commercial/SME customers, and private homeowners. Pricing is project-specific and not publicly disclosed; revenue is generated through project-based installation contracts and multi-year service/maintenance agreements. Since May 2024, Diehl has operated as a subsidiary of Apleona Wolfferts Gruppe, itself part of the pan-European Apleona Group's integrated facility management platform.

Name

Diehl GmbH - Technische Gebäudesysteme

Legal name

Diehl GmbH

Website

https://diehl-gmbh.de

Company type

Private

Founded year

1933

Operating status

Operating

Headcount range

11–50 employees

Short description

Diehl GmbH - Technische Gebäudesysteme (Diehl Apleona Wolfferts) is a German technical building equipment provider founded in 1933, delivering full-chain HVAC, sanitary, electrical, refrigeration, and renewable energy services from 8 regional branches to industrial, public, commercial, and private customers.

Ownership category

akta.pro rank

Product category

Building Technical Services

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220)

SIC

General Bldg Contractors - Residential Bldgs (1520)

akta.pro primary industry

New Construction HVAC Rough-In & Final Set (Residential/Light Commercial) (HSAOAGAL)

akta.pro secondary industry

Blast Chiller & Specialty Refrigeration Service (HSAOAJAJ)

Keywords

• Technical building equipment
• HVAC installation services
• Building automation systems
• Heat pump installation
• Building technology services

Headquarters

HQ city

Baumholder, Rheinland-Pfalz

HQ country

Germany

HQ region

Europe

Offices8 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Technical Building Systems Installation and Service: The company generates revenue through planning, installation, and ongoing service/maintenance of technical building systems including heating, ventilation, air conditioning, refrigeration, sanitation, electrical, MSR, renewable energies, and swimming pool technology. Services are delivered to private customers, industry, commercial, and public sector clients. Revenue is project-based and service-contract driven.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels8 records

Core offering

Diehl GmbH is a German technical building equipment (TGA) provider that plans, installs, and services heating, ventilation, air conditioning, refrigeration, electrical/MSR/building automation, sanitary, photovoltaic, and swimming pool systems. The company delivers the full value chain — from project development, energy consulting, and TGA specialist planning through installation to ongoing service and maintenance — for both private and business customers from its 8 regional offices.

Product overview

Diehl Apleona Wolfferts is a comprehensive technical building services (TGA) provider offering a unified portfolio of heating, ventilation, air conditioning, refrigeration, electrical/building automation, photovoltaics, sanitary, and swimming pool technology services. The company operates as a single integrated provider delivering all trades from a single contact, supported by in-house project development, energy consulting, TGA planning, and project management services. Service and maintenance offerings ensure ongoing operational reliability across all installed systems.

Differentiator

Problem solved

Functional benefit

Products and services

• Heating Systems (Heizung) — including BHKW, fuel cells, solar thermal, heat pumps Installation and maintenance of heating systems for residential, commercial, and industrial buildings, including combined heat and power (BHKW), fuel cells, solar thermal, and heat pump technologies.

Quantifiable outcome

• Annual revenue exceeds €100 million with approximately 570–600 employees across 8 locations
• +3 more outcomes

Named customers8 records

Segments10 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Scale indicators6 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• ENGIE Deutschland: Major German subsidiary of the French ENGIE group, offering integrated facility management, technical building services and energy solutions. Comparable in HVAC/refrigeration/heat pump scope and decarbonization focus.
• Dussmann Group: German integrated facility services group offering technical building management, HVAC maintenance and energy services. Comparable in service/maintenance revenue mix and public-sector client base.
• VINCI Energies Deutschland: German operations of VINCI's energy and building technology division; offers electrical, HVAC and building automation solutions to industrial and infrastructure clients. Comparable in technical building equipment scope.
• Apleona Wolfferts Gruppe: Parent group of Diehl since 2024; headquartered in Cologne with 18 locations and 1,100+ employees offering full building technology (TGA) services across Germany. Direct overlap in heating, ventilation, refrigeration, MSR and renewable energy installation.
• Stinnes Facility Solutions: German provider of technical facility management and building services including HVAC and building automation. Comparable in recurring service/maintenance contracts with industrial and commercial clients.
• WISAG: One of Germany's largest facility services and building technology providers, covering HVAC, electrical, plumbing and maintenance for commercial and industrial customers. Comparable in service breadth and integrated TGA offering.

Direct peers

• SKE Group: Germany-based HVAC and refrigeration contractor (now part of ENGIE) serving industrial and commercial customers with heating, ventilation, refrigeration and sanitary installations. Closely comparable in technical service portfolio.
• SPIE GmbH: German subsidiary of French SPIE group, providing multi-technical building services (electrical, HVAC, plumbing) for industrial, commercial and public-sector clients. Comparable full-chain TGA service model.
• Gegenbauer Gruppe: Berlin-based building services and TGA contractor with multi-trade capabilities (heating, ventilation, sanitary, electrical) across Germany. Comparable in regional contractor positioning and project-based service model.
• Caverion Deutschland: Germany arm of Nordic-listed Caverion, providing technical building equipment, HVAC and facility services with similar full-chain TGA capabilities. Directly comparable in services mix and customer segments (industrial, public, commercial).

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/diehlapleonawolfferts
• LinkedInlinkedin.com/company/diehl-gmbh-tgs
• Instagraminstagram.com/diehlapleonawolfferts

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries3 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 Diehl GmbH - Technische Gebäudesysteme