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Caring for Your Furnace
Clean or replace a disposable furnace filter regularly during the winter--check the filter monthly. Brush and vacuum the heat exchanger surfaces yearly, as recommended in your owner's manual. Before the heating season, clean the blower blades and seal air leaks in ducts with duct tape. Some fan motors and fans need oiling; some have sealed bearings. If recommended by your maintenance manual, oil the bearings according to the manufacturer's directions.  Most heating maintenance plans cover yearly cleaning of your furnace. 

BE SAFE!
If you smell gas in your home or near your furnace, particularly immediately leave the house, leave the doors open, and call your gas utility or the fire department from your neighbor's house or a cell phone. (Do not use the phone in the house or turn light switches off or on.)