I don't use the electric furnace in my house, but in the summer I do that with my a/c. We have one bedroom (approximately 200sf.) that we don't use on a regular basis so I close the door, close and cover the air vent with a heavy book or other object to prevent air seepage and place towels between the bottom of the door and floor.
In the winter we use a Monitor 20K BTU thermostatically controlled vented kerosene heater to heat our home. I also keep that same bedroom closed off during the winter and cover all the air vents in the house to the electric heating/air duct with a piece of radiant barrier held down with magnets to keep the cold air from coming up into the house from the duct system which is routed underneath the house and keep from losing heat out through the duct work. This has been an unusually cold winter for us and since we started using heat around the middle of Oct. 2013 I've used about $500. worth of kerosene to heat about 1200sf our home to 68* during the daytime and 64* at night. Kerosene is $4.399 per gallon here so I've used just over 100 gallons so far this winter. I also had radiant barrier placed under the metal roof when the roof was replaced in 2011 which has helped with heating/cooling costs.
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