How do I choose the right Sterling TD duct furnace for my building?

Hello, thank you for reaching out. Choosing a Sterling TD duct furnace is based on your building's heating requirements, its existing ductwork, fuel availability, and installation conditions. The TD Series is available in seven sizes that range from 100,000 to 400,000 BTU and also in two different heat exchanger materials - aluminized steel or stainless steel. Which these options allow customers to select a heating capacity that fits their application. A qualified HVAC professional can help to determine the appropriate size, airflow and installation requirements for your space. 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.