AirTjek

What AirTjek does

AirTjek Boligventilation ApS is a Danish privately-held company founded in 2002 and headquartered in Gedved, Denmark, that designs, sells, installs and services residential ventilation, heat-recovery and indoor climate systems for new-build houses and apartments across the country. Its core offering centers on Nilan-sourced heat-recovery ventilation (HRV) units with moisture-controlled operation that recover up to 95% of exhaust-air heat and are calibrated to comply with the Danish BR18 building regulation (0.35 l/s per gross m²). The company complements these units with a portfolio of Berbel range hoods (Ergoline, Glassline, FLU Firstline) and two proprietary integration solutions — AirSplit for apartments and a BR18 solution for houses with a 5kg hybrid activated-carbon filter — that are engineered to prevent negative pressure in tight modern buildings. The Nilan Gateway hardware add-on provides IoT/app-based remote monitoring and creates a service-contract pathway.

AirTjek generates revenue through four streams: (1) hardware sales of ventilation units, ducts, fittings and range hoods, including a self-installation package priced at approximately 31,000 DKK for a 200 m² house; (2) professional installation, commissioning and calibration services performed by its in-house Danish technicians; (3) recurring maintenance and service agreements (four filter changes per year, two drain inspections per year, valve/duct cleaning) plus remote support via the Nilan Gateway; and (4) replacement filter e-commerce through the dedicated FilterShop at filtershop.dk. The go-to-market is sales-led and direct, with the company claiming to visit 20-30 construction sites per day and complete roughly 2,000 houses per year, plus large multi-unit projects for developers such as Plushusene, Nordstern, Dansk Bolig Byg, PAB, Buchwaldsbro and Ovenvande.

Customer concentration sits between new-house builders (primary) and apartment developers (primary), with homeowners and commercial buildings as secondary segments. The business model combines transactional hardware revenue with an installed-base annuity from filter replacement and service contracts, and is anchored by a nationwide direct field-sales and technician network rather than third-party distribution.

Name

AirTjek

Legal name

AirTjek Boligventilation ApS

Website

https://airtjek.dk

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

11–50 employees

Short description

AirTjek Boligventilation ApS is a Danish privately-held company, founded in 2002 and based in Gedved, that designs, sells, installs and services residential heat-recovery ventilation systems, Berbel range hoods and BR18-compliant indoor climate solutions for new-house builders, apartment developers, homeowners and commercial buildings across Denmark, completing roughly 2,000 houses per year through a nationwide direct field-sales and technician network.

Ownership category

akta.pro rank

Product category

Residential Ventilation Services

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (23822), Plumbing, Heating, and Air-Conditioning Contractors (238220), Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564), Steam & Air-Conditioning Supply (4961)

akta.pro primary industry

Ventilation System Installation (Exhaust Fans, ERV/HRV, Make-Up Air) (HSAOAGAI)

akta.pro secondary industries

HVAC Air Filtration & Air Purifier Installation (HSAOAIAC), Commercial HVAC/R Installation (Rooftop Units, Split Systems) (HSAOAGAH), Smart Air Quality Sensors, Purifiers & Humidifier/Dehumidifier Integration (HSAOANAH)

Keywords

• Residential ventilation
• Indoor climate systems
• Heat recovery ventilation
• Range hood installation
• HVAC service

Headquarters

HQ city

Gedved

HQ country

Denmark

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Equipment Sales: Sale of ventilation systems, heat recovery units, range hoods, ducts, fittings, and accessories. Includes Nilan Comfort 300 and other ventilation equipment with moisture control.
2. Installation Services: Professional installation, calibration, and commissioning of ventilation systems by certified Danish technicians. Pipe installation on construction sites and system startup/calibration services.
3. Maintenance and Service: Annual service agreements, filter changes (4x yearly), drain inspections (2x yearly), valve/duct cleaning, and troubleshooting visits. Service contacts offered via filtershop.dk.
4. Filter Sales: Sale of replacement filters for various ventilation systems through Filtershop.dk online store.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

AirTjek Boligventilation ApS designs, supplies, installs, and services residential indoor climate and heat recovery ventilation systems (primarily Nilan units) across Denmark. The offering bundles hardware (ventilation units, ducts, range hoods, filters) with nationwide installation, calibration, commissioning, and recurring maintenance services, including specialized integrated range hood solutions (AirSplit for apartments, BR18 solutions for houses) developed with partners Berbel and Nilan.

Product overview

AirTjek is a Danish indoor climate and residential ventilation company offering a system portfolio centered on three core pillars: (1) an indoor climate/heat recovery ventilation unit (Indeklimaanlæg) — sourced primarily from Nilan — as the core platform; (2) a suite of Berbel range hood sub-brands (Ergoline, Glassline, FLU Firstline) and the proprietary AirSplit and BR18 range hood solutions that integrate with the ventilation system to prevent negative pressure in tight buildings; and (3) the Nilan Gateway as an IoT add-on enabling app-based remote monitoring and control. AirTjek also provides nationwide installation, commissioning, and maintenance services, and operates a FilterShop for replacement filters. The company was founded in 2002 and covers approximately 2,000 homes per year.

Differentiator

Problem solved

Functional benefit

Brands

• FilterShop: A filter shop selling replacement filters for various ventilation systems. Accessible at filtershop.dk.

Products and services

• Indeklimaanlæg (Indoor Climate System) A whole-house ventilation and heat recovery system that supplies fresh air, removes stale air, and recovers up to 95% of heat from exhaust air. Humidity-controlled and BR18-compliant. Includes pipework, fittings, sound dampers, mounting drawings, and professional commissioning by AirTjek technicians. Targeted at Danish builders and developers of new residential homes.
• Selvmontage Pakke (Self-Installation Package) A do-it-yourself installation package of the indoor climate system for owner-builders, including the Nilan Comfort 300 unit, all pipes and fittings tailored to the home, mounting hardware, sound dampers, and mounting drawings. AirTjek technicians perform final commissioning and calibration.
• Nilan Gateway

Quantifiable outcome

• Heat recovery efficiency up to 95%
• +3 more outcomes

Named customers6 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Feature4 records

Partnerships

Two partnerships are on record, tiered core.

• berbelcoreTechnology or IntegrationGerman manufacturer of premium extractor hoods using patented water-based grease absorption technology. AirTjek has developed integrated solutions combining berbel extractor hoods with Nilan ventilation systems. The partnership provides solutions that prevent negative pressure in tight buildings while achieving high grease capture efficiency.
• NilancoreTechnology or IntegrationDanish manufacturer of ventilation and heat recovery units. AirTjek specializes in Nilan systems and offers the Nilan Gateway for smartphone control. They provide CTS400 and CTS602 control systems integration with remote monitoring capabilities for service and maintenance.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Exhausto A/S: Danish ventilation specialist serving residential and light commercial customers with HRV systems and ducting. Direct domestic competitor with overlapping Danish residential installer channel.
• Zehnder Group: Swiss-listed manufacturer of residential and commercial HRV/ventilation units and heat exchangers. Direct overlap with AirTjek's core indoor climate/heat-recovery value proposition serving European residential new construction.
• Lindab AB: Swedish-listed ductwork, indoor climate, and ventilation solutions provider with strong Scandinavian presence. Comparable as both a ducting/ventilation product manufacturer and end-to-end provider for residential and commercial buildings.
• Swegon Group: Swedish-owned (by Latour) ventilation and indoor climate solutions provider active across residential and commercial segments in Northern Europe. Strongly comparable product portfolio in HRV and air handling.
• Systemair AB: Swedish ventilation manufacturer and solutions provider offering residential HRV, commercial ventilation, and field services across Northern Europe. Closely comparable business model combining equipment supply with installation/service.
• Dantherm Group: Danish-headquartered climate control solutions provider spanning residential, commercial, and mobile climate solutions. Comparable as a Danish-rooted Northern European climate-control specialist with installation/service orientation.
• Vent-Axia: UK-based residential ventilation and heat recovery specialist with installation and service networks. Comparable in focus on residential indoor air quality, MVHR/HRV systems, and integration with smart home/app control.
• Renson: Belgian family-owned ventilation, indoor climate, and sun protection specialist with strong Benelux/Northern European residential presence. Comparable in residential HRV positioning and end-customer focus on modern tight buildings.

Broad incumbents

• FläktGroup: European HVAC/air management major serving non-residential and large commercial applications (data centers, healthcare, industrial). Overlaps in ventilation/air-distribution technology but operates at a much larger scale and in different end-segments.

Others

• Nilan A/S: Danish manufacturer of the ventilation and heat-recovery units AirTjek installs. Functions as a primary supplier and technology partner rather than direct competitor, but product overlap in residential HRV makes them adjacent.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

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 AirTjek