According to the U.S. Department of Energy, the proper use of a programmable thermostat can cut heating and cooling bills from 5% to 20%. Programmable thermostats lets you set a schedule that will automatically change the temperature of your home or certain areas of your home several times during a 24 hour period. Most programmable thermostats are either digital, electromechanical or some mixture of the two. You can save money on your heating and cooling bills by simply resetting your thermostat when you are asleep or away from home. You can do this automatically without sacrificing comfort by installing a programmable thermostat.
Nest Learning Thermostat
(Compatible with 95% of 24V systems)
900 Family 7-day Digital Programmable Comfort Control