Lower CO2 levels for a better indoor climate at school

A good and balanced indoor climate is important for children’s well-being and learning at school, also at Åsen Skole (a Norwegian primary school). With a vision for “safety in learning and play”, a new ventilation solution became an important subject in order to promote the children’s mental and physical safety.
Åsen Skole Pic 2

Åsen Skole was built in 1965 and is located in rural surroundings in Åsmarka in Ringsaker Municipality. In addition to the school, there is also an after-school program (ASP) and a kindergarten in the building, which now houses 60 students and 12 employees.

Danger of school being closed

When Åsen Skole in 2019 received a notice from the authorities about the CO2 levels at the school being too high, it became important for Ringsaker Municipality to find an effective and quick solution to the bad indoor climate, in order to prevent the school from shutting down – a solution they could find the funds for in the budget. It became important that the solution considered that the school did not have an attic suitable for long ducts, and if it became necessary to go into common rooms, this would lead to large building costs.


Indoor climate is an important area for the municipalities, as they are responsible for the health of students and children in schools and kindergartens. After a check-up at the school, the authorities found too high levels of CO2 at Åsen Skole. This indicates a poor indoor climate, which can affect children’s concentration and ability to perform, as well as lead to higher absence amongst the students.”

- Trond Jensen, Ringsaker Municipality


Trond Jensen from Ringsaker Municipality contacted Airmaster. Trond knew that a decentralized solution would be the best for Åsen Skole when considering the short delivery time, the short installation time, not needing big structural interventions, control and regulation of air while registering values, and the economic benefits of operation, such as low energy consumption and high heat recovery. The project was approved by the authorities, and the installation started in the summer of 2020.


A decentralized solution

“If we had chosen a central solution, the costs would have been high as such a solution would have led to significant building-related work, as well as fire technical measures. We therefore chose to install Airmaster units in all classrooms and group rooms.”

- Trond Jensen

If Åsen Skole had chosen to go with a central solution, the school would have had to be shut down during the project and a specialized company would have had to complete the extensive installation process and replace the current ventilation solution. With a decentralized ventilation solution, the units can easily be installed room-by-room, and there is no need to close the school. The decentralized solution can also be continuously expanded if necessary, based on the school’s budget or if it becomes relevant to expand the school building in the future.


Demand-controlled ventilation with a focus on CO2

As a starting point, Åsen Skole installed 10 Airmaster units, which included seven AM 1200, two AM 900 and one AM 300. 

Åsen Skole Pic 4

An AM 1200 is used as a notice board.

In order to take care of the high CO2 levels in the building, the units were set up with CO2 sensors. A CO2 sensor is used to control the ventilation based on the need of each room, where the ventilation unit is automatically controlled based on the goal of keeping the CO2 values at a desired level. A time schedule was also incorporated into the ventilation units, in order to prevent the units from running outside of working hours – making sure the school saves money and energy.


Easy control of ventilation and CO2

All the units that the school has installed can be controlled centrally via Airlinq Online, Airmaster’s online web portal. This way, the school easily gets a quick overview over the operating status, CO2 levels etc. Operational data is also stored for a period of one year, which gives the school the opportunity to regularly show the authorities that the CO2 levels have improved.


Now that the ventilation units have been running for a period, there are many positive reactions to the new and improved indoor climate.


We achieved a very energy efficient solution by choosing CO2 sensors in all rooms, as well as connecting the units to Airmaster’s own web solution for control, Airlinq Online. We have subsequently used Airlinq Online to document the CO2 levels in all the classrooms when the rooms are in full use, which have been well received by the authorities. The results were well within the accepted values. Ringsaker Municipality is very happy with the solution and can safely recommend the solution further.”

- Trond Jensen

Åsen Skole Pic 6

AM 900


The school’s principal has subsequently also conducted a survey with the teachers, where the result shows that everyone is happy with the new indoor climate that is offered to the teachers and students. Ringsaker Municipality is also happy with the results and is very glad for the opportunity to get documented results from the school.

Ready for a breath of fresh air

At Airmaster, we are “decentral” through and through. We are unrivalled when it comes to creating the best indoor climate and optimal well-being because we take each room and its occupants into account – and because we constantly strive to improve on what we do.

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