Reasons Your Furnace Is Blowing Cold Air

A heating appliance is indispensable for indoor comfort during the cold season. Therefore, it can be frustrating if your unit blows cold air instead of heated air. Furthermore, this can leave you with an uncomfortable atmosphere, not to mention spiking utility bills. So, if this is the case, you must engage a furnace repair expert to see why your unit won't heat indoors as needed. They will assess it and remedy the underlying problem for peak performance. The following are the reasons your system is blowing cold air.

Wrong Thermostat Settings

If your heating appliance is blowing cold air, your thermostat could be the culprit. For instance, engaging the thermostat at 'cool' instead of 'heat' may lead to the unit blowing cold air. Additionally, the wrong fan configuration, such as positioning it to 'on' rather than 'auto,' will force the fan to operate without heating cycles. On the other hand, a faulty thermostat will not signal the unit to engage the burners for hot air. As a result, the unit will blow cold air from the vents.

The Pilot Light Is Out

Your heating unit sustains wear and tear over time, reducing operational efficiency. As such, the furnace thermocouple may deteriorate from mechanical or chemical stress, restricting the current passage. This causes the pilot light to go off and close the gas supply. Alternatively, if you place your unit in place with a strong draft, it may easily go off. This is because such a location causes the system to run out of combustible air, compromising the pilot light. Thus, you should hire a heating repair expert to fix the thermocouple and place the furnace in a location with constant airflow for proper ignition.

Gas Supply Is Faulty

When you experience cold air from the vents, your gas supply could be faulty. Note that this can happen due to the gas lines degrading over time, causing the fittings and connections to become loose and leak gas. On the other hand, root infiltration on underground utility lines can result in gas line obstruction. Ultimately, leaks and blockages hinder your heating unit from accessing gas, leading to furnace dysfunction. 

Filters Are Dirty

Your furnace utilizes filters for clean air circulation. However, these filters may gradually clog with airborne contaminants, restricting airflow. As a result, the system will strain to draw sufficient air for heating, causing it to overheat. Ultimately, this leads to the heating unit shutting down, causing the fan to blow cold air. Therefore, you may want to clean or replace your filters regularly for proper airflow.

You should know that a heating appliance blowing cold air will increase your energy bills significantly. Thus, you should schedule routine furnace maintenance to ensure your system offers peak performance. For more information on furnace repair, contact a professional near you.