There are a few indications you should have house ventilation, such as:
1. Lasting odors
If you have issues getting strong aromas out of your home, you might have a ventilation concern.
2. Musty air
The air in your house should seem fresh, but stale zones mean you could have insufficient ventilation.
3. Disproportionate dust
Dust can build up more frequently in rooms with stifled airflow.