There are a a variety of warning signs you should look into house ventilation, including:
1. Persistent odors
If you have issues getting intense odors out of your space, you could have a ventilation problem.
2. Stuffy air
The air in your home should feel fresh, but stuffy zones mean you may have poor ventilation.
3. Lots of dust
Dust can build up more frequently in rooms with stifled airflow.