I have not read them, but I have heard there are research articles that demonstrate that it costs just as much (if not more) to warm a cold home (in heating season) than it does to just maintain a temperature. You’re not just warming the air, but you also have to spend time warming up the structure and it’s contents, and that can take a lot of time/energy. So if you’re going on vacation, sure, drop the thermostat, but if you are lowering the temperature during the work/school day and/or doing it at night, you are paying for it during your warm up periods. The same is true but in reverse for cooling.
100%.
I agree with this.