There are a a couple signs you should have house ventilation, starting with:
1. Lingering odors
If you have issues getting intense smells out of your house, you may have a ventilation concern.
2. Musty air
The air in your rooms should feel fresh, but stuffy zones mean you may have inadequate ventilation.
3. Disproportionate dust
Dust can build up more often in homes with poor air movement.