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A thermostat is a device used to control the amount of heat developed in a furnace. Thermostats can be used with hand-fired heating equipment as well as automatic types, such as coal stokers, oil burners, and gas. As has been pointed out, a thermostat controls the amount of heat developed in a hand-fired furnace by regulating the position of the dampers. On automatic coal stokers, the thermostat controls the position of the drafts as well as the amount of fuel fed into the furnace by the stoker. On oil and gas burning equipment, it controls the flow of fuel into the burner. Basically, a thermostat is an electric switch actuated by a change in temperature. The thermostat is set for any temperature desired, and when the house temperature falls below this setting, the thermostat automatically makes the changes necessary in the heating unit to produce more heat. When the house temperature rises to that set on the thermostat, the heat is automatically reduced. There are many kinds of thermostats. The simple ones are set by hand, while the more complex have built-in clock mechanisms and can increase or decrease the heat at the hours for which they are set. This is particularly welcome on cold winter mornings, for the house can be comfortably warm by the time the household arises.
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