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80+ municipalities have created a better indoor climate with SKYEN

SKYEN is used in more than 4,500 rooms and helps municipalities meet indoor climate requirements – without expensive renovations.
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A luminous cloud can save school students' poor indoor climate

A luminous cloud can save school students' poor indoor climate

32 schools across the country have been testing Skyen for a year and a half

School monitor
Practical: The school opens the window when there is a lack of oxygen

Practical: The school opens the window when there is a lack of oxygen

Øster Farimagsgade School uses the CLOUD instead of ventilation

The public primary and lower secondary school
Small gadget for 1,600 kroner can save municipality millions

Small gadget for 1,600 kroner can save municipality millions

The Municipality of Vejle has chosen to invest in SKYEN instead of a ventilation system costing millions.

Vejle County Newspaper
Sky helps students control the indoor climate

Sky helps students control the indoor climate

At Bækkegårdsskolen, they have 'SKYEN' in all rooms. And it helps with the indoor climate.

Zealand News
Red cloud reminds the class to air out

Red cloud reminds the class to air out

Students air out the rooms themselves while Tingbjerg School in Brønshøj waits to be renovated and have mechanical ventilation installed.

BFA
Used today in 0+ municipalities

Aabenraa, Aalborg, Aarhus, Ærø, Albertslund, Assens, Bogense (Nordfyn), Borup (Køge), Brenderup (Middelfart), Charlottenlund (Gentofte), Esbjerg, Farsø (Vesthimmerland), Farum (Furesø), Faxe, Fredericia, Frederiksberg, Frederikshavn, Frederikssund, Frederiksværk (Halsnæs), Greve, Haderslev, Hadsten (Favrskov), Hjørring, Holbæk, Horsens, Hørve (Odsherred), Hvidovre, Ishøj, Lyngby Taarbæk, Kibæk (Herning), Copenhagen, Kolding, Løsning (Hedensted), Næstved, Nakskov (Lolland), Nørre Nebel (Varde),
Nyborg, Nykøbing F (Guldborgsund), Odense, Præstø (Vordingborg), Ringkøbing, Rødovre, Rønne (Bornholm), Roskilde, Rungsted Kyst (Hørsholm), Skanderborg, Slagelse, Søborg (Gladsaxe), Sønderborg, Sorø, Struer, Svendborg, Tønder,
Vallensbæk Strand, Vedbæk (Rudersdal), Vejle, Viborg

Municipalities chose THE CLOUD because it works from day one – no IT department, no WiFi, no complicated setup.
Mikkel As Hansen
Project Manager, Municipality of Copenhagen

"SKYEN has stopped the indoor climate discussions. Now there is no doubt about when we should go outside."

Peter Lindeskov
Technical Service Manager, Bogense School, Nordfyns Municipality

"SKYEN is generating a lot of (positive) attention – both among students and colleagues."

Mikkel Dam
Mayor, Faxe Municipality

"The CLOUD is too good to be true – smart technology that we're going to get a lot of use out of."

Maria D. Nielsen
Implementation Consultant, Vejle Municipality

"SKYEN makes it legal to ventilate – we see much more frequent venting and fewer inconveniences."

Birgitte Moller Hansen
Head of Home Care, Halsnæs Municipality

"SKYEN has improved the well-being and health of our employees – the headaches have disappeared."

Axel Bech
Headmaster, Øster Farimagsgades School

"Inexpensive solution for engaging and student-friendly division of responsibilities – highly recommended."

Marianne Leegaard Moller
Senior Citizens and Health Manager, Ærø Municipality

"SKYEN helps us to ventilate when needed."

Inger
senior citizen with sclerosis

"It's a big help to me – especially at night when the air is bad."

From 2026, the EU will require indoor climate documentation in public buildings

The European Parliament's directives EPBD 2024/1275 and Air Quality Directive 2024/2881 oblige public building owners to continuously document and monitor the indoor climate. SKYEN automatically provides the data you need for APV (Workplace Assessment), ESG reporting, and future compliance.
Read our full analysis of the legal requirements →
Person lufter ud, ÅBNs CO2-måler, SKYEN, skifter farve fra rød til blå ved bedre indeklima og en blomst bliver frisk igen

THE CLOUD: No app. No manual. Just look at the light.

THE CLOUD is designed for everyone to understand – students, teachers, caretakers, and care staff. The sensor lights up in three colours and tells you exactly what needs to be done:

🔵 Blue — Good indoor climate
CO₂ below 1,000 ppm. The air is fresh, concentration is high. No action needed.
🔴 Red — Ventilate now
CO₂ above 1,000 ppm. Concentration drops significantly. Open windows and doors.

No WiFi. No app installation. Plug it in and it works.

See SKYEN in action

A better indoor climate strengthens both well-being and decision-making power

... Get the solution for your needs!

Why is it important?

  • "53% of classrooms in Denmark exceed the CO₂ limit" – gymnasieskolen.dk
  • Poor indoor climate is among the biggest causes of sick leave – ewii.dk

Documented benefits of better indoor climate:

Up to 14% better concentration – equivalent to a whole school year's learning

Realdania, "Socioeconomic benefits of improved indoor climate"

58% fewer sick days - equivalent to four days per student per year

World Green Building Council, "The Business Case for Health and Wellbeing in Green Building"

70% Lower risk of disease transmission with airborne viruses and bacteria

Government of the United Kingdom, "New film shows importance of ventilation to reduce spread of COVID-19"

Face it. Most sensors require half a meteorologist's education to understand.

ÅBN's sensor and web app are built for everyone to join in. Based on the latest research, we have simplified your indoor climate to the Indoor Climate Label™.

All you have to do is scan the included QR code and see which areas you should improve.

Raise your parameters to an AC Indoor Climate Mark™ for the most optimal indoor climate.

See the dashboard live – book a 20 min. meeting →

The only solution in Denmark with documented behavior change

Up to 0% indoor climate improvement

Solely through behavioural change

... because we work systematically with behavior and knowledge

In collaboration with Realdania and Implement Consulting Group, we have documented that SKYEN's indoor climate box improves indoor climate by up to 97% — not by renovating, but by changing behavior with our classroom kit:

TaleSpin - "habit kit"

Systematise your indoor climate with the "hero of the week" and Brain Breaks.

Air for learning - teaching material

Four lessons of material that build knowledge in Science/Technology about air and why we breathe.

Indoor Climate Ambassador Training

Transform heroes into ambassadors in a 4-hour dedicated course tailored to your challenges.

Employee onboarding

Let us help you kick-start good behavior together with your employees.

"Our study clearly shows that SKYEN, together with a habit kit, supports new sustainable habits in the classroom, which gives students a healthier indoor climate.

When the CO2 level becomes too high, it starts to have a negative impact on the students' well-being and learning. But with the CLOUD, that is actually eliminated.

Here, a year later, there is no indication that the effect is returning. It's pretty crazy."

Lasse Frost
Consultant, Implement Consulting Group

See the complete Realdania documentation →
Billede af Lasse Frost fra Implement Consulting som var konsulent for ÅBN til dokumentation

Read more about our package solutions

  • 💡 Better concentration
    Fresh air = better focus in class.
  • 🧠 More learning
    Less fatigue. More energy in class.
  • 👩‍🏫 Students take responsibility
    Make them an active part of the solution.
  • ⚡ Easy in everyday life
    The sensor shows exactly when you need to ventilate.
Klassens indeklima kasse ÅBN
The classroom's indoor climate box
From 2.495,00 DKK (eksklusiv moms)
Institutionens indeklima kasse ÅBN
The institution's indoor climate box
From 1.995,00 DKK (eksklusiv moms)

SKYEN actively contributes to the Sustainable Development Goals – and helps you do the same.