Use the cold water setting on your clothes washer when you can. Be sure to clean your clothes dryer's lint trap after each use. Use the moisture-sensing automatic drying setting on your dryer if you have one. If possible, unplug electronic devices and chargers that have a block-shaped transformer on the plug when they are not in use. For computer scanners, printers and other devices that are plugged into a power strip, simply switch off the power strip after shutting down you computer.
Dirty filters restrict airflow and increase energy use.
Keep you furnace clean, lubricated and properly adjusted. Install a programmable thermostat. If you have a heat pump, select a model designed for heat pumps. Plug your home's leaks. Install weather-stripping or caulk leaky doors and windows and install gaskets behind outlet covers.