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 routine ...
AI-generated summary reviewed by our newsroom. Read our AI Policy. Furnaces typically fail after 15-20 years; schedule replacement before winter peak. Gas units cost $3,000-$8,000 and offer lower ...
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