There are a a variety of signals you should look into house ventilation, such as:
1. Stubborn odors
If you have trouble getting strong odors out of your home, you could have a ventilation concern.
2. Stuffy air
The air in your home should feel fresh, but stale areas mean you may have inferior ventilation.
3. Excessive dust
Dust can get stuck more rapidly in rooms with inadequate airflow.