Remember guys. Hair dryers, lights, coffee makers etc add heat to your home. Furnace will run less.
Dryers are the biggest pigs. Not only do they draw power (esp electric) but they suck the warm house air out and make your furnace work harder.
Central vac does too if the unit is in the garage. I close the door to the laundry room and open the window in that room so that the dryer sucks in mostly outside air. Or try to dry clothes on a warmer day.