What is the definition of a programmable furnace? A programmable furnace is a type of heating system that can be programmed to turn on and off at certain times, or at certain temperatures. It is a relatively new type of furnace, but one that has become popular for its energy efficiency and convenience. Programmable furnaces are typically equipped with a digital thermostat, which allows users to set the temperature at which the furnace should turn on and off. This way, users can set the furnace to turn on at a certain time, or when the temperature reaches a certain level. It also helps to maintain a comfortable temperature in the room, which can help to reduce energy costs. Programmable furnaces are popular in both residential and commercial buildings, due to their ability to provide consistent heating while being energy efficient. They are designed to provide efficient heat distribution and even temperature throughout the home. This type of furnace also ensures that the temperature of the air within the home remains the same, regardless of the