When you think about the biggest energy users in our country, transportation and power plants come to mind. And then there are buildings. They account for one-fifth of our energy use. And much of that energy is pure waste, leaking from walls with poor insulation and lights left on when no one is around.

Energy efficiency is one of the few issues with wide support from Republicans and Democrats, as well as private industry.

Our Inside Energy reporter Jordan Wirfs-Brock brings us the latest in a series on energy policy and what is likely under the new GOP-controlled Congress.