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 ...

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Key Points Check thermostat settings, filters, and fuel supply first when your furnace blows cold air.Call an HVAC technician for issues like sensor failures, clogged burners, or duct leaks.Skipping ...