10/20/2026
Shutting the vents in the guest room or the basement seems like an easy way to save on heating, but it usually backfires. Your system is sized to move a set amount of air through the whole duct system, and closing registers makes the blower push against more pressure. That extra pressure forces air out through leaks in the ductwork, often into attics and crawlspaces, and can make the furnace run hotter than it should. The closed off rooms also get cold enough to pull heat from the rooms around them. If a few rooms are always too warm or too cold, having the airflow professionally balanced is a better fix. Lebanon and Springboro homeowners with upstairs rooms that never feel right, that's a common sign the ducts need attention.