There are some pretty cool newish ventilation products that are minimally invasive (e.g. don't have to run need ducts). Lunos makes a tiny ductless HRV that can provide indoor/outdoor air exchange. There are other products, too. https://www.buildwithrise.com/stories/ductless-heat-recovery lists several.
What I'm thinking of is more two places:
- an office (fortunately not my case)
- rented apartment that would not let me drill a hole in the wall
Good info to have though! I feel like I would definitely look at setting that up in most cases
It trained me to open windows to create circulation, but unfortunately some of the reduced airflow was unsolvable short of me like... installing more ventilation into my room.
I am glad I am aware of CO2 stuff (and definitely feel like I've reduced headaches and the like from being more mindful) but sometimes you will be informed of a bad CO2 environment but be totally incapable of doing anything about it and that really sucks.