Give your old-school heating and cooling system a higher education. The simple addition of a programmable thermostat allows you to create personalized programs based on your lifestyle, enabling you to heat or cool your home when you need it—reducing energy costs. In fact The U.S. Department of Energy recommends programmable thermostats to save up to 30% on heating and cooling bills. Most thermostats are designed around your heating and cooling system. The Aprilare 8400 Series Programmable Thermostats are designed around you.