The White-Rodgers 1F83-0471 universal programmable thermostat has a large, 4 square-inch Blue display. The 1F83-0471 is a non-programmable thermostat. The 1F83-0471 is a universal thermostat that will work on all furnaces, air conditioners and heat pump systems. For use on 24 volt and millivolt systems. Other features include furnace filter change reminder, auto-changeover, keypad lock and adjustable temperature display. White-Rodgers is a business of Emerson Climate Technologies, the worlds leading provider of heating, ventilation, air conditioning and refrigeration solutions for residential, industrial and commercial applications. Combining technically superior products and services from industry-leading companies and brands with global engineering, design, distribution, installation and monitoring capabilities help Emerson Climate Technologies to create reliable, energy efficient climate systems that improve human comfort, safeguard food and protect the environment.