Instead of trying to keep the entire house at 68, I’ve set my thermostat to 64. The heating system here is not at all equal, some rooms get 10-15 degrees more heat than others. Setting your thermostat for the rooms you need/use most (not the whole house) is the way to go. Saves energy, saves money.
Update 12/21/21
62-63 is what I’m doing now
Update 1/25/23
61 = 73