There are a a variety of warning signs you should consider house ventilation, such as:
1. Stubborn odors
If you have issues getting potent smells out of your space, you might have a ventilation issue.
2. Stuffy air
The air in your space should be fresh, but stale areas mean you might have insufficient ventilation.
3. Lots of dust
Dust can develop more frequently in areas with inadequate air movement.