Pay attention to furnace smells. A metallic or burning odor could mean overheated electrical components. A musty smell suggests moisture or mold in the ducts. And if you ever detect a sulfur or rotten ...

Dear Jim My furnace is old, but it still seems to heat well. My budget is tight, so I need to keep my utility bills low and the furnace working for a long time. Are there any simple tune-up checks I ...