Day-to-Day Ventilation refers to the continuous process of supplying fresh air and removing stale indoor air to maintain a healthy, comfortable, and energy-efficient environment within a building. By promoting natural or mechanically assisted airflow, it helps regulate temperature, control humidity, and reduce the buildup of pollutants, odors, and excess heat during normal operations. Commonly integrated into commercial, industrial, and residential spaces, effective day-to-day ventilation enhances occupant well-being, supports productivity, and reduces reliance on air conditioning systems, contributing to overall building performance and sustainability.