How to diagnose HVAC system problems?

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1 Diagnosis. Begin your diagnosis of the HVAC system by verifying that it has power. … 2 Furnace. Switch the thermostat to “heat” mode and set the thermostat 3 to 5 degrees above the room temperature. 3 Air Conditioner. Set the thermostat to “cool” mode. … 4 Ventilation. Ensure the fan is on at the thermostat and the registers are open. …

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