Old Line Heating and Air is the go-to ductwork installer for homeowners and businesses in Harford County, MD. We design and install custom duct systems to ensure even airflow, energy efficiency, and better air quality. Whether it’s new construction or retrofitting older homes, our team handles it all with precision. Leaky or outdated ducts could be costing you money—our inspections help identify and resolve those issues fast. We offer solutions that improve comfort while reducing your HVAC system's workload. Better ductwork means better heating and cooling performance throughout your space. Let us help you breathe easier with a duct system built to last.