There are a several warning signs you should have house ventilation, including:
1. Lingering odors
If you have issues getting potent aromas out of your house, you may have a ventilation problem.
2. Stale air
The air in your house should be fresh, but stuffy spots mean you could have insufficient ventilation.
3. Disproportionate dust
Dust can build up more rapidly in homes with poor air movement.