Programmable Thermostat

You can save money on your heating and cooling bills by simply resetting your thermostat when you don’t need it.
The most basic programmable thermostats could save you up to 15% on your energy bills, but only if they’re used correctly.
Much of the energy expenditure seems to be used for space conditioning during times that the home is unoccupied or occupants are sleeping. Therefore, these “unoccupied” periods often represent an untapped opportunity for reducing home energy consumption.
A programmable thermostat will allow you to program a heating and cooling schedule, it can be set to begin its cool down well before you leave or go to bed and return to its regular temperature before you wake up or return home.
This can be the same every day of the week, and within each day you can choose temperatures that suit certain times. It’s as simple as that. Once programmed, the thermostat will do everything for you. Your system will come on at the time you choose and switch up, down or off when needed.
The bigger the difference between indoor and outdoor temperatures, the more you save by adjusting the thermostat, the lower the internal temperature, and the slower your home loss heat. In fact, as soon as your house drops below its normal temperature, it will lose energy to the surrounding environment more slowly. So the longer your house remains at the lower temperature, the more energy you save, because your house has lost less energy than it would have at the higher temperature. The same concept applies to raising your thermostat setting in the summer.
Keep the temperature set at its energy savings set-points for long periods of time, for example, during the day when no one is at home, and through the night, after bedtime. You can Heat and cool individual rooms instead of the entire house to maximize your energy savings if you tend to spend a lot of time in just one or two rooms.
Analyses from recent field studies have suggested that programmable thermostats may be achieving considerably lower savings than their estimated potential.

In particular:
1) Many households with programmable thermostats may be unable, unwilling, afraid, uninterested, or otherwise reluctant to deploy default programs or to create or deploy custom programs;
2) Many households set back or set up their thermostats manually, thus leaving less savings possibilities to be garnered by a programmable thermostat;
3) The automatic program used with the thermostat may not be any more conservative than use of manual thermostats setback or setup by hand;
4) Many consumers have mental models of heating and cooling that lead them to believe they will not save energy from setting up or setting back other than long periods of time.

If you have a programmable thermostat already and you already follow this advice, you are likely seeing a savings on your energy bill. If so, you might not benefit from a smart thermostat as much as someone who doesn’t adjust their settings.