There are a a couple signals you should look into house ventilation, including:
1. Enduring odors
If you have trouble getting potent smells out of your home, you may have a ventilation concern.
2. Stuffy air
The air in your rooms should seem fresh, but musty sectors mean you might have inadequate ventilation.
3. Lots of dust
Dust can develop more often in areas with stifled ventilation.