A programmable thermostat can save you money on your utility bill - up to 33%, if used as directed. You can set it up to adjust the temperature when you are away from home or asleep - when you don't necessarily need optimum comfort - and your HVAC equipment runs less. Plus, your heating or cooling comes back to a comfort level automatically when you come home or wake up. Most Honeywell Programmable Thermostats carry the EPA's EnergyStar rating and are designed to be very easy to use.