Stay warm or cool while enjoying energy savings and precise, environmental control with the T8602D2018 Honeywell programmable thermostat. This affordable thermostat provides electronic control of 24-V single-stage heating and cooling systems, 750-mV gas heating systems, and 750-mV gas heating systems with 24-V cooling systems. The large backlit LCD gets an extra boost of brightness and clarity from battery power as part of the Chronotherm design from Honeywell.AS A CONFIGURABLE THEMROSTAT THIS MODEL CAN BE USED TO REPLACE MANY DIFFERENT THERMOSTATS!!!The attractive styling complements any home and is even able to connect with an outdoor temperature sensor for a more accurate temperature reading than you will find with a thermometer. Begin experiencing Chronotherm temperature control with the Honeywell T8602D2018 thermostat.