I just bought a ceramic electic space heater. Assuming it runs constantly 15 hrs/day on cold days at $.10/kwh, that's $2.25/day. If I can cut an average cold day of heating my house from $10./ day to $5./day by using the ceramic heater only in the room I'm in and cutting the household temperature to 50 degrees, I'm guessing I could save $2.75/day.
OK, so this is just BS armchair calculations.
My question is, has anyone tried this approach and does it work?