The answer to 'why is my ductwork' is that there could be several common issues causing problems with your home's ductwork. Some of the most frequent causes include leaks, blockages, damage, or improper installation. Symptoms may include uneven heating/cooling, high energy bills, and poor indoor air quality.
If you suspect issues with your ductwork, it's best to have a professional HVAC technician inspect it. They can diagnose the root cause and recommend the appropriate repairs or replacement. While some minor ductwork adjustments may be DIY-friendly, more complex problems often require the expertise of a licensed HVAC contractor.