This PDF is a very helpful resource for improving the efficiency of your duct system by the Office of Building Technology, State and Community Programs, Energy Efficiency and Renewable Energy, U.S. Department of Energy.
This PDF shows how to seal air leaks and save energy! It is by the Office of Building Technology, State and Community Programs, Energy Efficiency and Renewable Energy, U.S. Department of Energy.
This PDF demonstrates how proper duct installation increases the efficiency of your home, by the Building Technologies Program, Energy Efficiency and Renewable Energy, U.S. Department of Energy.