There are a several indications you should consider house ventilation, including:
1. Stubborn odors
If you have trouble getting potent aromas out of your home, you may have a ventilation issue.
2. Musty air
The air in your rooms should feel fresh, but stuffy zones mean you may have inadequate ventilation.
3. Lots of dust
Dust can develop more rapidly in rooms with stifled airflow.