Just to say it again, extreme cold is where a thermostat is of little help.
But imagine that there are 4 or 5 months a year where the outdoor temperature is 15 or 20 degrees colder than a comfortable indoor temperature. And imagine turning down the thermostat during the night in those periods, not just during unoccupied times.
(I realize that more energy is used during cold periods, but some huge portion of the country lives in areas that rarely see 20 for the several months they are below 60).
But imagine that there are 4 or 5 months a year where the outdoor temperature is 15 or 20 degrees colder than a comfortable indoor temperature. And imagine turning down the thermostat during the night in those periods, not just during unoccupied times.
(I realize that more energy is used during cold periods, but some huge portion of the country lives in areas that rarely see 20 for the several months they are below 60).