I'll second this, keep the gas furnace at a low level and then only boost the area you will be in. (plus you can't let parts of the house freeze,
) Also the electric heat then only has to make up the difference between your base temp and your comfortable temp.
Then extra clothes, a blanket while sitting on the couch, or a space heater all could boost the temp where you are actually.
Then of course if expect guests you can just turn up the gas and warm the entire house, so they don't have to snuggle up with you
.