Rugs on hard floors.
Close heater vents on rooms that don't get used (for ducted heating) so all heat goes to rooms used and heater is more effective.
If u have a double oven use smaller oven instead of large.
Turn off tv/radio if ur not in the room.
Don't use dryer unnecessarily. Hand washing on clothes horse then give a shorter stint in the dryer if needed.
Turn hot water service down.
Get insulation if you haven't got it.
Use appliances such as dishwasher and washing machine and dryer during off peak times.