If you're driving more than 70 km/h and you're too hot, you're better off using the air conditioner than opening your windows. The increased drag from the open windows will lead to higher gas consumption than running the A/C.

Old appliances use more energy than modern ones. A typical 1990 appliance – whether fridge, freezer, dishwasher, washing machine or dryer – uses about twice the energy that a new one does

A screensaver doesn’t save energy. Adjusting your power settings to switch it into standby mode saves up to 90% energy. Or why not switch it off altogether when it’s not in use

Through energy-focused renovations, homes that are more than 25 years old save an average of 35 percent of their energy use. Homes that are more than 50 years achieve even greater savings – an average of 38 percent.

High-end PCs use more electricity (ca. 300W) than energy-efficient ones with average components (ca. 75W)