There are a several indications you should have house ventilation, such as:
1. Persistent odors
If you have problems getting potent aromas out of your home, you likely have a ventilation concern.
2. Stuffy air
The air in your home should feel fresh, but stuffy sectors mean you likely have issues with ventilation.
3. Disproportionate dust
Dust can get stuck more often in homes with insufficient ventilation.