To take advantage of built-up heat, dry several loads consecutively. Keep the outside dryer vent clean and make sure it's vented properly. Dry full loads, but avoid overloading. Loads that are too full don't allow air to circulate, increasing drying time. Keep light fixtures clean.
Dirt can greatly reduce light output.
Open shades and blinds during the day to make the most of natural light, shut them in the evening to prevent heat loss. Supplement ambient lighting with task lighting instead of lighting an entire room. Use the appliance usage calculator to estimate the energy used by your household appliances. If you have a fireplace , close its damper when not in use. Consider replacing older furnaces and water heaters with new ones, which use fuel more efficiently.