The majority of furnaces use a fossil fuel, such as oil, propane, or natural gas, to produce heat. The furnace air handler forces unheated air past burners that produce flames from the gas or oil. The heated air is then carried throughout the home through the duct system. The furnace is equipped with a thermostat that automatically turns the furnace on when the temperature falls below the designated temperature and off again once the temperature reaches the desired setting.

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