Homes consume an enormous amount of energy, especially in cooling. Once you've audited your home for energy use (even if you haven't) some simple moves can cut your electricity bill. Keep your house cool with natural ventilation instead of air conditioning as much as possible. Use in-room, ceiling, or whole-house fans to move air throughout the house. Blocking sunlight during hot hours of the day can help lower your cooling load. If your house uses electricity for water heating, wrapping your water tank in an insulating blanket can save on power.