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 ...
The Cool Down on MSN
A 34-year-old furnace keeps working, but HVAC pros say the heat exchanger is the real test
"The new ones have more safeties built in and won't have the pilot light." ...
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