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Our plug-and-play systems can operate in a low-heat environment inside buildings or on office premises. Millions of tons of CO2 from the city air can be captured by our HVAC retrofittable carbon capture machines.

If the world wants to avoid catastrophic climate change, switching to carbon neutrality is not enough. IPCC has warned that limiting global warming to 1.5C by 2100 will require technologies such as direct air capture for large-scale deployment of carbon dioxide removal measures.

About Soletair Power

Established in 2016, Finnish carbon capture technology provider company Soletair Power is focused on global negative emissions by integrating Direct Air Capture into commercial building HVAC systems, both indoors and outdoors. The captured CO2 is stored in containers and supplied to concrete manufacturers for permanent storage.

In 2021, Soletair Power demonstrated a compact Power-to-X methane production module at Expo 2020 Dubai and installed an outdoor DAC unit at the ZBT hydrogen and fuel cell center in Duisburg, Germany in 2022. In 2023, they installed their HVAC-integrated DAC system at seed funding company Wärtsilä’s Sustainable Technology Hub building in Vaasa, Finland.

Soletair Power HVAC-integrated CO2 Capture system can capture up to 20 tCO2/year/unit and reduce energy consumption and cost of ventilation.

Soletair Power Building Carbon Capture System HVAC Integrated Direct Air Capture in Building CCUS CO2 capture for emission reduction

Our Story

We turn buildings into carbon sinks.

Soletair Power addresses the issue of CO2 emissions originating from buildings, responsible for nearly 40% of global CO2 emissions. Existing direct air capture solutions face challenges in cost and efficiency. Soletair Power’s breakthrough lies in achieving net-zero emissions by integrating direct air capture with building ventilation systems, providing an economically viable solution for capturing CO2, thereby generating negative emissions, reducing energy consumption, and improving indoor environments.

Soletair Power’s patented onsite HVAC integrated CO2 capture technology empowers commercial property owners to reduce their buildings’ overall emissions while achieving significant cost savings. The technology captures CO2 from the air by retrofitting ventilation systems with CO2-binding materials, later converting the captured CO2 into concrete. The modular carbon capture systems operate with a plug-and-play approach, enabling property owners to rapidly and easily install the system.

One HVAC-integrated DAC unit (in buildings with ventilation of 3 m3/s) can capture up to 20 tons of CO2 per year, equivalent to 3 hectares of Nordic forest aged 30 years. If building ventilation runtime is controlled by CO2 levels, the system will also help lower the costs of HVAC energy use.

Rather than relying solely on CO2 emission offset sales, Soletair Power benefits from stable building temperatures for efficient and weatherproof onsite CO2 capture. The technology operates below 100°C temerature leveraging existing heat, providing a remarkable edge over competitors.

The easy deployment of our modular carbon capture technology can significantly impact the carbon market when scaled. This benefits building owners, making it a financially feasible solution that can contribute positively to the planet.

We’ve showcased our ambient air CO2 capture and fuel production using Power-to-X technology at Expo 2020 Dubai. Successful pilot initiatives have been undertaken, including a containerized outdoor carbon dioxide capture unit at ZBT in Germany with a daily capture capacity of 21 kg CO2. Another unit deployed at the Wärtsilä Sustainable Technology Hub in Vaasa, Finland, has a daily capture capacity of 50 kg.

In 2024, a client is deploying our HVAC integrated CO2 Capture unit at a factory in Vantaa, Finland where the capture CO2 will be converted into a valuable resource. The next building ventilation integrated unit is scheduled to be deployed in Aarhus, Denmark. Each of these solutions has the potential to capture close to ~20 tonnes of CO2 per year per ventilation unit.

Every day, we try to innovate ways to enhance our technology, our way of work and our spectrum of imagination. Our values live through the entrepreneurial spirit of our diverse and inclusive network.

What we do

We develop modular CO2 capture solutions retrofittable with ventilation systems. The technology empowers commercial property owners to capture CO2 onsite, decrease the building’s HVAC energy consumption, and lower carbon footprint. Captured CO2 can be utilized in the concrete industry resulting in negative emissions. Since the system always supplies CO2-lean air, it is possible to supply better air indoors.


To turn buildings into carbon sinks by integrating DAC with HVAC, decrease energy costs and emissions, and reach an annual capture capacity of 130,000 tCO2 by 2030.


To build the world’s largest distributed CO2 capture ecosystem and turn buildings into active protectors of the planet.

Mockup of Soletair Power Building HVAC integrated CO2 Capture Unit placed inside a building

Building CO2 Capture Unit

Distributed DAC Concept

Empowering buildings with onsite CO2 capturing systems

In 2023, we integrated a CO2-capturing system in a commercial building in Vaasa, Finland.

How it works.

We utilize the temperature vacuum swing adsorption process. From the HVAC system, incoming air is pushed through our DAC filters containing our own proprietary-made amine-functionalized solid sorbents, and carbon dioxide is adsorbed by them. When the filter is saturated, the machine is closed and regenerated via vacuum & heating to collect the CO2. The captured CO2 is stored in a separate storage container.

Minimizing the energy required for carbon capture and sorbent regeneration has been the primary goal behind much of our carbon capture research.

Learn more about our technology.

Our Journey and Timeline

Solving global problems through technology.


Company founded by Ari Piispanen and Pasi Vainikka in April 2016.


First pilot unit delivered, meeting with Dubai businessmen, Ari and Pasi refined ideas.


Seed funding received from Wärtsilä. National funding received from ELY. Operations started.


First setups in lab, design phase of the bigger unit started.


Received national funding from Business Finland. Began developing Expo 2020 Dubai Power-to-X Demo Unit and Vaasa STH Building HVAC Connected CO2 capture Unit.


Demonstrated the magic of making fuel from thin air in front of the world with the Power-to-X Demo Unit at EXPO 2020 Dubai. Signed contract with ZBT.


Started CO2 Capture and Utilization mega project with a TBA company. Headcount reached 17. Delivered containerized Outdoor CO2 Capture Unit to ZBT, Germany.


Delivered modular HVAC Integrated CO2 Capture Unit to Wärtsilä STH, Finland. Collaboration begins with regional CO2 utilization partners in different continents.


Project begins at a Factory in Vantaa, Finland for creating X product from CO2 by HVAC Integrated CO2 Capture Unit. Interest from Dubai, Denmark, India, and Finland for the HVAC Integrated CO2 Capture Unit. Outstanding response from customers for pre-ordering Indoor CO2 Capturing Air Purifier Unit.

LL97 or Local Law 97 legislation mandates that all large buildings (>25,000 square feet) in New York City reduce their carbon emissions — all regulated through monthly disclosures. Buildings that do not comply with the law will face fines on an annual basis of $268 per ton of emissions above the limit.

Founder’s dream

“Buildings will capture more CO2 than they emit”

“Buildings already have fans. Buildings already have optimum temperatures. Why not utilize those fans, those conditions to capture CO2 from the passing air? We’ve started with a dream to turn millions of buildings around the world into CO2-capturing machines and we are going forward with it.”

– Ari Piispanen, Co-founder, Soletair Power


“The DAC technology is a link to close the carbon cycle and to enhance the storage of renewable power, we are happy to install Soletair Power’s CO2 capture system and demonstrate the whole variety of Power-to-Gas applications on our test field in Duisburg.”

Ulrich Gardemann

Group Leader, Methane Technologies, ZBT, Germany

01 01

Building future cities

Enables building owners to capture CO2, offset emissions, save energy, minimize cost, and earn credits.

02 02

Retrofittable solutions

Irrespective of size, make or age, our technology uniquely fits the building’s HVAC systems.

03 03

Better productivity for offices

HVAC-DAC coupling ensures productive CO2-lean air for the building dwellers.

04 04

Making the planet healthier

Offsets CO2 emissions from the building resulting in a decrease of CO2 from the atmosphere.

How can your building protect the planet?

Our technology