The answer to 'ductwork blowing cold air' is that there are several common causes, including a problem with the furnace, leaks in the ductwork, or improper insulation. This can lead to cold air blowing through the vents instead of warm air.
Some common symptoms include rooms feeling colder than they should, high energy bills, and uneven heating throughout the home. Solutions may involve adjusting the furnace, sealing ductwork leaks, or adding more insulation. While some minor issues can be fixed DIY, it's generally best to call a professional HVAC technician to diagnose and resolve the problem properly.