Installation Details · FAQ

What does balanced attic ventilation actually mean?

Balanced means roughly equal intake (soffit) and exhaust (ridge or gable) net free area. The reason it matters: airflow is driven by convection (hot air rises, drawing cool air in). If your exhaust is bigger than your intake, the ridge vent will start pulling air down from the inside of the house through the attic floor — which means it’s pulling your heated or cooled indoor air out of your home through the attic. That’s an HVAC efficiency disaster.

Inversely, more intake than exhaust just means some intake doesn’t get used. That’s harmless. The goal is intake equal to or slightly larger than exhaust. Trill measures both and adds intake (soffit panels) far more often than exhaust, because most Illinois homes have undersized intake.