If your furnace smells like it's burning, how worried should you be? Learn about all the furnace smells—dust, must, rotten egg, and more—and what you should do about it. As temperatures start to drop, ...

Keep the air conditioner free of moisture buildup to prevent mold and mildew from growing. Regularly clean the filter, drain pan, drain line, and coils to remove any mold or mildew. Fully clean, dry, ...