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 ...

Pay attention to furnace smells. A metallic or burning odor could mean overheated electrical components. A musty smell ...

Pour a cup of warm water into the drain to keep the trap primed. Some people also use condensate tablets [such as the ...

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