There are a a variety of warning signs you should have house ventilation, starting with:
1. Lasting odors
If you have trouble getting strong smells out of your home, you might have a ventilation concern.
2. Stale air
The air in your home should be fresh, but stale areas mean you might have inferior ventilation.
3. Disproportionate dust
Dust can develop more rapidly in rooms with insufficient airflow.