You'll not only save energy, you'll avoid scalding your hands. Check if your water heater has an insulating blanket. Put on a sweater and turn down the thermostat. Turn down the thermostat to 62 o at night or if you're at work all day. If you have an unused room, close the register or turn off the radiator.
Vacuum vents, radiators and registers.
Make sure they are not blocked by furniture. Wash your laundry in cold or warm water rather than hot. Clean or replace furnace and heat-pump filters. Install a programmable thermostat to control the temperature automatically at night and when you are at work. Seal the largest air leaks in your house.