Function

• Programmable thermostats are "smart" thermostats, meaning they can be programmed to change temperatures at different times of day. This allows users to reduce home temperature during periods when there's no one in the house, without having to manually set the thermostat every day.
  
  

Benefits

• Setting the thermostat lower during cold winter months can save a significant amount on heating costs. According to ENERGY STAR, "Homeowners can save about $180 a year by properly setting their programmable thermostats and maintaining those settings."
  
  

Other Considerations

• Programmable thermostats will save on energy costs only if they're programmed to reduce the normal amount of heating in a home. ENERGY STAR cites several basic guidelines for programming thermostats correctly.