Ninja tip 3: Do not close vents and registers in unused rooms. It does not save energy.
When an energy ninja closes vents, the pressure in the ductwork system increases and the system needs to work harder to keep up the temperature. A harder working system is a higher energy use system. Also, higher pressure in the ducts means more air loss due to leakage in the ductwork. Closing vents to save energy is one of the most common ninja mistakes, even for seasoned energy ninjas. It does allow for some heat control, but the system must work extra hard an therefore does not reduce energy consumption.