There are a a couple warning signs you need house ventilation, such as:
1. Stubborn odors
If you have issues getting potent odors out of your house, you may have a ventilation concern.
2. Musty air
The air in your space should feel fresh, but stale sectors mean you could have inadequate ventilation.
3. Built up dust
Dust can get stuck more frequently in rooms with inadequate airflow.