My mother instilled fear in me. The fear of what would happen if the washer/dryer was left on when You'd leave the house...the house might catch fire. The same fear if you left the a/c on overnight. Or, don't leave any of the sliders open for cool air during the night, in case someone might try to break in.
To this day.....if I'm leaving the house, the w/d are both off. I'd never leave the a/c on, etc.