Air dry clothes. Shut off lights, computers and other electronic appliances when you're not using them. Use the bathroom or kitchen fans only while showering or cooking on the stove to avoid moisture problems. Use a microwave or toaster oven for smaller items. Install a low-flow showerhead.
Showers use less hot water than baths.
Close your fireplace damper and seal the opening shut when not in use. Close all window coverings at night to keep the heat in. Install an automatic setback thermostat that adjusts temperature according to your daily schedule. Use motion sensors for outdoor lighting. You'll still have security and save energy.