A programmable thermostat can pay for itself in energy saved within four years. The location of your thermostat can affect its performance and efficiency. Place thermostats away from direct sunlight, drafts, doorways, skylights, and windows. Also make sure your thermostat is conveniently located for programming. Some modern heating and cooling systems require special controls.
Heat pumps are the most common and usually require special setback thermostats.
These thermostats typically use special algorithms to minimize the use of backup electric resistance heat systems. Electric resistance systems, such as electric baseboard heating, also require thermostats capable of directly controlling 120 volt or 240 volt line-voltage circuits. Only a few companies manufacture line-voltage setback thermostats. The best thermostat for you will depend on your life style and comfort level in varying house temperatures. If you decide to choose an automatic thermostat, you can set it to raise the temperature before you wake up and spare you some discomfort.