Lampert + Walker AG

What Lampert + Walker AG does

Lampert + Walker AG is a Swiss heating and cooling installation contractor headquartered in Rapperswil-Jona, canton St. Gallen, founded in 1978 and operating today with 13 employees plus 2 apprentices. It specializes in planning, installation, and servicing of building energy systems — including heat pumps (using WPSM-certified modules), district heating connections (KVA and ARA), natural gas and biogas, wood chip and pellet boilers, solar thermal, and energy-efficient cooling — for residential, commercial, and industrial customers in the Zürichsee and Zürich Oberland region. The company runs a 24/7 emergency on-call service and also serves a small number of specialty accounts such as the Knie Circus vehicles and laboratory buildings.

The company makes money through four streams: project-based installation contracts, recurring maintenance and emergency service contracts, paid consulting and planning (including GEAK energy assessments and impulse consulting for renewable heating), and hardware sales tied to solar thermal systems. Pricing is project-by-project with no publicly disclosed price list. Go-to-market is direct, sales-led, and regional, with customers acquired via the company website, the Suissetec industry association, MailChimp newsletter, and word-of-mouth reputation. The company holds ISO 9001:2015 certification (renewed 2022) and is a Suissetec member.

Lampert + Walker AG has been a wholly-owned subsidiary of Energie Zürichsee Linth AG since 2013, when it was sold as part of a founder succession arrangement; the corporate group also includes MZ Sanitär + Heizung AG in Lachen. In 2021, the company merged with Walker Heizungen AG to form the current Lampert + Walker AG, and in 2017 it rebranded and installed Patrick Senn as managing director succeeding Werner Arnold. The business operates as an Aktiengesellschaft (Swiss stock corporation), is privately held, and has no disclosed funding rounds or external investors.

Name

Lampert + Walker AG

Legal name

Lampert + Walker AG

Website

https://waermeloesungen.ch

Company type

Private

Founded year

1978

Operating status

Operating

Headcount range

1–10 employees

Short description

Lampert + Walker AG is a Swiss heating and cooling installation contractor in Rapperswil-Jona serving residential, commercial, and industrial customers in the Zürichsee and Zürich Oberland region with heat pumps, district heating, gas/biogas, wood, solar thermal, and cooling systems, plus consulting, maintenance, and 24/7 service; it is a subsidiary of Energie Zürichsee Linth AG.

Ownership category

akta.pro rank

Product category

Building Technology Services (Heating & Cooling)

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220), Plumbing, Heating, and Air-Conditioning Contractors (23822)

akta.pro primary industry

Residential HVAC System Installation (Furnace/AC/Heat Pump) (HSAOAGAA)

akta.pro secondary industries

Heat Pump Repair & Maintenance (HSAOAHAD), Heat Pump & Smart HVAC Controller Integration (HSAOANAD), Expansion Tank, Circulator Pump & Zone Valve Service (HSAOACAG)

Keywords

• Heating system installation
• Heat pump solutions
• Building HVAC services
• Solar thermal systems
• Heating maintenance contracts

Headquarters

HQ city

Rapperswil-Jona

HQ country

Switzerland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Marketing or Sales, Others

Revenue model

1. Heating System Installation and Construction: Installation of heating systems including gas, oil, solar, pellets, firewood, and heat pumps for residential and commercial buildings. Project-based revenue from new installations and renovations.
2. Maintenance and Service Contracts: Ongoing service, maintenance, and repair services for heating and cooling systems including 24-hour emergency on-call support. Provides recurring revenue through service relationships.
3. Consulting and Planning Services: Expert advisory services including impulse consulting for renewable heating, building energy assessments (GEAK), and comprehensive heating system planning. Generates consulting fees for expert advice.
4. Solar Thermal Systems: Sale and installation of thermal solar systems for domestic hot water and space heating support.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Lampert + Walker AG is a regional Swiss building-technology contractor that sells, plans, installs, and services heating and cooling systems for residential, commercial, and industrial buildings. Its portfolio spans heat pumps, district heating, natural gas/biogas, wood heating (chips and pellets), solar thermal, and cooling systems, delivered together with consultation, planning, installation, and 24/7 maintenance services. The firm operates as a WPSM-qualified heat pump installer and Suissetec member, serving customers across the Zürichsee and Zürcher Oberland region from its headquarters in Rapperswil-Jona.

Product overview

Lampert + Walker AG is a building technology company specializing in heating and cooling solutions for residential and commercial buildings. The company offers a comprehensive portfolio of heating products including heat pumps, district heating, natural gas/biogas, wood heating (chips and pellets), solar thermal systems, and cooling systems. These core products are complemented by integrated services encompassing consultation, planning, execution, and ongoing maintenance. The company operates as a qualified installation firm under the WPSM (Wärmepumpen-System-Modul) program and provides impulse counseling for renewable heating solutions. Services are delivered through a team of 13 employees supported by apprentices, serving customers across the Zurichsee and Zurich Oberland region.

Differentiator

Problem solved

Functional benefit

Products and services

• Heat Pump Systems (Wärmepumpe) Heat pump systems that extract natural heat from ground, ambient air, or water to provide environmentally friendly building heating; approximately 80% of total energy comes from renewable environmental sources through a four-stage compression cycle, with a COP of ~4 (1 kW electrical input produces ~4 kW heating output). Sold, installed, and serviced by Lampert + Walker AG as a WPSM-qualified heat pump installer for residential and commercial customers.
• District Heating (Fernwärme) CO2-free district heating connections supplied from local waste-to-energy plants (KVA) and wastewater treatment facilities (ARA), providing nearly emission-free heating that is independent of foreign energy imports and designed for near-maintenance-free operation over decades. Delivered as a building connection and customer-system installation service.
• Natural Gas / Biogas Heating (Erdgas/Biogas) Natural gas and biogas heating installations with over 90% primary energy efficiency, offering reliable and economical energy supply with easy installation and low maintenance costs. Includes both conventional natural gas and renewable biogas options.
• Wood Heating Systems (Holzheizung) Wood heating installations including wood chip and wood pellet boilers using locally produced, CO2-neutral fuel from sustainable Swiss forestry. Sold and installed for residential and commercial buildings seeking renewable biomass heating.
• Solar Thermal Systems (Solaranlage) Thermal solar systems that provide ecological supplementation for domestic hot water preparation and space heating support, offering sustainable energy cost reduction with modern, efficient, and durable technology. Sold and installed as a standalone offering or as a complement to other heating systems.
• Building Cooling Systems (Kühlung) Energy-efficient building cooling solutions with innovative systems designed to reduce energy consumption while improving indoor climate. Includes planning, implementation, and maintenance of cooling systems for residential and commercial buildings.
• Consultation & Impulse Counseling (Beratung/Impulsberatung) Comprehensive consultation services including on-site assessment, system evaluation, cost analysis, and qualified impulse counseling for renewable heating solutions. Offered to property owners, architects, and engineering firms to support heating-system decision-making and energy transition planning.
• Heating System Planning (Planung) In-house planning team providing customer-specific design, system calculation and sizing, project verification, coordination with HVAC trades, and preparation of installation documentation with a focus on sustainability and energy efficiency. Delivered as a standalone planning service and as part of new installation projects.
• Installation & Execution (Ausführung) Qualified installation and execution of all types of heating systems across all dimensions, including gas, oil, solar, pellets, firewood, and heat pumps, with emphasis on careful, clean, and professional workmanship. Provided by trained heating installers.
• Maintenance & Repair Service (Service) 24/7 emergency hotline (Pikettdienst) and service request system for troubleshooting and maintenance of heating and cooling systems, with on-call service availability 7 days per week, 24 hours per day. Includes recurring maintenance contracts and emergency repair.

Quantifiable outcome

• Heat pumps generate approximately 80% of required total energy from renewable environmental sources
• +2 more outcomes

Named customers2 records

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

Three partnerships are on record, tiered core and minor.

• Energie Zürichsee Linth AGcoreStrategic or Co-development Partner · 1 January 2013Parent company and controlling shareholder since 2013. Lampert + Walker AG is part of the Energie Zürichsee Linth AG corporate group, which also includes MZ Sanitär + Heizung AG in Lachen. The three companies share common values including training of apprentices, regional anchoring, high customer satisfaction, and future-oriented action.
• MZ Sanitär + Heizung AGminorStrategic or Co-development PartnerSister company within the Energie Zürichsee Linth AG corporate group, located in Lachen (canton Schwyz). Companies work together under shared ownership and aligned values.
• SuissetecminorChannel Partner/ Reseller/ DistributorProfessional industry association membership (Nordostschweiz, Sektion Zürich) providing industry representation, training resources, standards, and professional development support for heating technicians.

Scale indicators4 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Hoval AG: Liechtenstein-based (Swiss-adjacent) heating technology manufacturer and solutions provider specializing in heat pumps, biomass, and gas heating systems. Comparable product portfolio to L+W's renewable heating focus with broader brand reach across Switzerland.
• Walter Meier (Walter Meier Klimageräte Schweiz): Swiss HVAC contractor specializing in climate, heating, and ventilation for residential and commercial buildings. National service network offering heat pump and cooling installations directly competitive with L+W's regional offering.
• Viessmann (Schweiz) AG: German heating technology manufacturer with Swiss subsidiary offering heat pumps, biomass, and gas heating systems through installer networks. Not a direct competitor to L+W's installation services but shapes the equipment market L+W works with.
• Meier Tobler Group: Swiss leading HVAC and building technology distributor/installer serving residential and commercial customers with heat pumps, heating, ventilation, and climate solutions. Larger national footprint and broader portfolio make it a direct larger-scale competitor in the same market L+W serves.
• Arbonia AG: Swiss-listed building components and HVAC solutions provider producing heating, ventilation, and climate systems for residential and commercial buildings. Operates at significantly larger scale across Switzerland and Europe, competing in same end markets.

Direct peers

• MZ Sanitär + Heizung AG: Sister company of L+W within the Energie Zürichsee Linth AG corporate group, located in Lachen (canton Schwyz). Provides plumbing, heating, and sanitary services — directly comparable operations sharing same ownership and values.
• Leiser Heizungen AG: Swiss regional heating contractor offering heat pump, gas, oil, and solar installations with planning, execution, and service. Comparable size and business model to L+W as a mid-sized regional heating installation specialist.
• Störi AG Heizungen + Solar: Swiss heating and solar installation contractor offering heat pump, solar thermal, and renewable heating solutions for residential customers. Most direct comparable as a similarly sized regional Swiss heating contractor with comparable service portfolio.

Others

• Energie Zürichsee Linth AG: Parent company of L+W; Swiss regional energy utility providing district heating, electricity, and energy services in the Zürichsee/Linth region. Relevant as the controlling shareholder and as the source of district heating infrastructure L+W connects to.

Regional players

• Schmid Energie AG: Swiss regional energy and heating solutions provider operating in other cantons but with comparable offering spanning heat pumps, solar, biomass, and heating installations. Similar business model focused on residential and commercial customers.

Market position

Strengths2 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/lampert-walker-ag

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Lampert + Walker AG