I keep my house at 70 degrees.
And as I wrote here, my electric bill had been nearly $200 for December. My gas furnace is supposed to take over from the heat pump at 32 degrees.....but it seemed to me it would take an hour or two for the heat pump to raise the temperature even two degrees.
So I put the system on Emergency Heat which means if I want heat, the furnace comes on.
My electric bill for January was $68.00.