For a time, the Department of Energy (DOE) debated whether or not to continue the ENERGY STAR label for programmable thermostats (sometimes called “set-back thermostats”). In theory, programmable thermostats can save approximately 8% each year on utility costs, or about $180 per year for a home with $2,200 in energy bills (see the ENERGY STAR site). The key, of course, is to establish a program that utilizes the setback feature of the thermostat. ENERGY STAR recommends that the setback for heating be at least 8 degrees F, and for cooling the setup be at least 7 degrees F. If the program is followed, then the homeowner can expect to achieve something like 8% in energy savings.
The problem is, of course, that the program in actual practice is rarely followed. That is why the DOE debated whether or not to continue the programmable thermostat participation in ENERGY STAR.
What happens? The other occupants of the home often override the programmed settings, and when doing so, as it turns out, actually set the thermostat higher in winter (or lower in summer) than the original setpoint temperature. In other words, let’s say the setpoint temperature is 70 degrees in winter and the thermostat is programmed to set back the temperature to 62 degrees during the day. In actual practice the thermostat would get over-ridden and the temperature set to 74 degrees.
If that’s frequently the case in your home, here’s a surprising alternative; simply program the thermostat to always set itself back to the setpoint; that is, you program the thermostat to set itself back to 70 degrees four times a day (particularly at specific times you feel will be most effective). In that way, when the kids, let’s say, come home and immediately go to the thermostat and set it to 74 — they’re cold! — the thermostat sets the temperature back to the original 70 degree setpoint a little while later.
Sound crazy? Perhaps. But in the real world sometimes “crazy” works better than “ideal”. Michael Blasnik found this alternative program can actually save just as much energy as the one suggested by ENERGY STAR (“Prioritizing Energy Saving Recommendations” workshop by M. Blasnick & Associates, Boston, MA). Of course, the more frequently the thermostat is capable of re-setting itself, the more effective it will be.
So if you live in a home where the thermostat is constantly being over-ridden, this might be the next best alternative for you, even if it sounds crazy.


