A programmable furnace thermostat is a device used to control the temperature in a home or business. It is typically programmed to turn the furnace on and off at predetermined times and temperatures. The programmable thermostat allows users to customize the temperature of their home and save energy. It can be used to heat or cool a home in an efficient manner, by regulating the temperature based on the time of day and the specific temperature that is desired. The thermostat can be programmed to turn the furnace on and off at preset times, and to adjust the temperature depending on the weather outside. It can be programmed to maintain a certain temperature for a certain time period, as well as to maintain a certain temperature throughout the day. This can help to reduce energy costs by ensuring that the temperature is kept at an optimal level. The programmable thermostat also provides an easy way to monitor and adjust the temperature of the home. It can be used to adjust the temperature of a room to maintain the