There are a a couple signs you need house ventilation, such as:
1. Lingering odors
If you have trouble getting powerful aromas out of your house, you could have a ventilation concern.
2. Stuffy air
The air in your home should seem fresh, but stale areas mean you may have poor ventilation.
3. Disproportionate dust
Dust can build up more often in areas with inadequate airflow.