Don't use the oven to heat your kitchen. A range is an unsafe and expensive appliance to use for space heating. Check your faucets. A drop a second can waste hundreds of gallons of hot water a year and waste the energy it took to heat it. If you don't need a light, turn it off.
Unnecessary lighting adds unneeded heat in the summer and can add up to a sizeable expense.
Low-volume shower heads maintain the full force of your shower while reducing the amount of water used. Drafts are a major source of energy waster. Cover windows with plastic. Insulate doors with insulation lining. Fireplaces are extremely inefficient and usually take away more heat than they produce.