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" Annual Furnace Checkup  1. If you use gas or oil heat, call a professional (your fuel supplier can recommend someone) to clean the furnace, inspect the flue and adjust the burner. You may need to have filters cleaned or replaced.   2. Check smoke and carbon monoxide detectors to be sure the batteries are working. A by-product of burning fuel, carbon monoxide is an odorless, colorless gas that can leak from your furnace and cause serious illness or death.   3. Always be alert to signs of gas leaks. If you notice a faint gas smell, check the stove first for unlit pilot lights or a burner that&amp;#039;s not completely turned off. However, if you smell a sudden, powerful gas odor, get everyone out of the house immediately. Do not turn on or off anything electric (any spark could be a hazard). Once you&amp;#039;re outside the house, call the gas company from your cell phone or from a neighbor&amp;#039;s phone. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.goodhousekeeping.com/home/cleaning/tips/a15249/furnace-repair-aug05/>