Only your parents know what the temperature your thermostat should be set at...
Ok...that might be a little over the top but you get the idea.
The thermostat can be the most important way for you to control energy consumption in your home. For every degree that you adjust your thermostat, it can adjust cause you energy efficiency up to 5%. By utilizing a smart thermostat, you can adjust your home's temperature to be set correctly when you aren't home. You can also control your temperature in your home by controlling your humidity.
Some Energy Companies offer rebates for Smart Thermostats.
By controlling your urge to play with the thermostat will save you money. Here is a fun video from the US Government going into a little bit more detail.