Can Sterling TD duct furnaces be installed with existing ductwork?

Hello, thank you for reaching out. Yes, these Sterling duct furnaces are designed to be used with existing HVAC systems and ducted air applications. They can be incorporated into a ductwork system to heat and distribute air throughout a building. Before purchasing, confirm that the furnace's heating capacity, airflow requirements, physical dimensions, and installation configuration are compatible with your existing system. If you have additional questions, please feel free to reach out over the phone to our Customer Service line at 1-888-901-5460. Have a great rest of your day.