The federal government estimates that $40 billion in energy savings is hiding in US commercial buildings

A pretty big wad of money — $40 billion — is hiding somewhere inside the lights, AC, thermostats, furnaces and fans of our offices, stores, hospitals and schools.
That’s the amount of money the federal government estimates we can save annually by reducing energy use in commercial buildings 20 percent by 2020. To achieve the goal, the Obama administration in 2011 initiated the Better Buildings Challenge, a way to encourage investment, share information and create demonstration projects that save energy.