The programmable thermostat is designed to help you save on the cost of heat (or cooling) by resetting the temperature settings for periods when you do not need it to be as warm (or cool) as when you are in the house and active or when you are away for extended times.The aim is to increase your comfort level, while decreasing the energy costs.
For example, during the night while you are asleep the temperature can be set lower (like about 62 degrees), because you’re in bed and under the covers. Shortly before your normal wake up time, say around 6:00 or so, you’ll want the temperature setting to be raised so you can arise to a warm house (like 68 or 70 degrees). Most people will be out the door and gone to work and school around 7:30 or 8:00 and since no one will be in the house the temperature can reset to a lower temp (like 62 again). If you’re going to get home in the early evening, say 5:30 or 6:00, the temperature can be reset shortly before you arrive home again so you can come home to a warm home ( 68 or 70 again) and stay warm right up until bedtime when the process can begin again. Not every home will be empty during the work day. Some of the family members may stay at home members in which case you won’t want to use the reset during the day.