The answer to 'why is my ductwork not heating' is that there could be several common causes, including a problem with the HVAC system, blockages in the ductwork, or issues with insulation. Some common symptoms include uneven heating, cold spots, or the system running constantly without reaching the desired temperature. Solutions may involve cleaning or repairing the ductwork, adjusting the HVAC system, or adding insulation.
For minor issues, some DIY troubleshooting and repairs may be possible. However, for more complex problems or anything involving the HVAC system itself, it's best to call in a professional HVAC technician to diagnose and fix the issue properly and safely.