Don't forget. Last one out, turn the lights off. It’s a wise refrain, but when you consider a home's lighting accounts for 5% of its total energy use, and 15% of its electricity use, there's perhaps a little more to do. Remembering to turn the lights off when you go on holiday is good advice. However, from a security viewpoint, it's also good advice to use timers or programmable smart light bulbs to turn a few lights on at various times in the evening. That way, it always looks like someone is home. Light bulbs give out heat as well as energy. Make sure your timers turn on energy-efficient light-emitting diode (LED) lights rather than older bulbs.
Halogen or incandescent light bulbs only convert around 5% of their electricity into light. Your vacation will give you the perfect opportunity to conduct an audit of your light bulbs before you head out.