The answer to 'when to replace ductwork' is that ductwork should typically be replaced every 10-15 years, or sooner if it shows signs of significant wear and tear. Ductwork can degrade over time due to factors like age, damage, leaks, and poor installation. Replacing old, inefficient ductwork can improve your HVAC system's performance, energy efficiency, and indoor air quality.
Some key signs it may be time to replace your ductwork include visible holes or cracks, excessive dust or debris buildup, uneven heating/cooling throughout your home, and high energy bills. A professional HVAC technician can inspect your ductwork and recommend the best course of action.