Ventilate correctly [1]

• If too little ventilation is provided, odors accumulate in the room air.
• But do not ventilate through windows that are constantly tilted - you can lost a lot of heat.
• At least 3 times a day, fully open all windows in the apartment for 5 to 10 minutes and then close them again.
• If your apartment has a ventilation system, set the controller one level higher.

Check ventilation system

• Change filters
• Make air volume adjustment by a ventilation company if there is a suspicion that some rooms get too little air compared to others
• Adaptation of the timer program to current needs by reprogramming (can usually be done by customers themselves)

Ventilation system with CO₂ sensor(s)

• Newer plants work demand-oriented, e.g. by means of CO₂ control, in order to not supply too large quantities of air, which can lead to an unnecessary drying out of the rooms.
• Such sensors can also be installed later and are available as well for residential systems.

References

[1] Hochschule für Technik & Architektur Luzern. (2020). Besser Wohnen: Tipps und Tricks für mehr Komfort. Bern. Energie Schweiz, Bundesamt für Energie (BFE). https://pubdb.bfe.admin.ch/de/publication/download/10079