Yes, we always recommend installing new ducts when switching from ducted gas heating to ducted air conditioning. Gas ducts are typically a different size and lack the insulation quality needed for efficient air conditioning. Additionally, older ducts can degrade over time, leading to air leaks and reduced performance. At AEU, we use R1.5-rated insulation, ensuring optimal energy efficiency and consistent airflow. While some providers may offer systems that reuse old ducts, we do not recommend this approach as it can compromise the performance and longevity of your new system.