unplug appliances and entertainment items when not in use.
fill in your freezer with empty boxes
draw curtains when sun is on that side of the house
Anyone have any others???
Use the 'no-heat' dry setting on your dishwasher. If you start it before you go to bed the dishes will be dry to be unloaded in the morning.
Turn down your water heater to 120 and make sure your tank is properly insulated. Depending how efficient your tank is you may be able to save more money by turning your water heater off during the majority of the day and just turning it on 15 minutes before you'll need a larger quantity of hot water (a parade of hot showers for example)
Don't run 'hot' appliances (oven, dryer, dishwasher) during the day in the summer. In the winter reverse that and let the residual heat keep the house warmer. TVs give off heat and use electricity too....I know it's summer vacation, but just saying haha
Better yet, don't use your dryer at all.
Turn down your thermostat in the winter, turn up your thermostat in the summer if you have central air. If you don't have central air put fans in the windows at night to draw cool air in and then shut the house up and draw blinds during the day to keep that cool air in as long as possible.
Clean coils or filters on all your appliances. They'll run more efficiently.