You will need one Sensibo Children's Healthy Bundle for each room where your children spend significant time, such as in their bedrooms and playrooms. Each bundle is designed to improve the air quality in a single room and works alongside the split AC unit in that space. To ensure your children are breathing healthier air throughout the day, it's recommended to install a bundle in every room they frequently use. This setup helps maintain a consistent and cleaner environment in all the areas where your children are most active.