And also worth buying those timer sockets, where you can switch electric appliances off and on at specific periods during the day.
We were burgled a couple of years ago, and apparently in the investigation (yes, the NY police actually do still investigate burglaries, even where not a huge amount of valuables go missing) our neighbours mentioned they'd noticed that our kitchen light was left on when we were away for the weekend! (Yes, it was, we thought to deter burglars). We invested in several timer sockets and now use them to switch on various appliances and lamps around the house, and switch them off again at appropriate times.