Heating equipment is vital during cold seasons for indoor comfort. However, you might feel frustrated when your unit is operating but blows cold air instead of hot air. This can create an uncomfortable environment, making your living space unbearable. Remember, since it can be hard to ascertain the cause of the malfunction, you should hire a heating system repair expert. They will diagnose your appliance and repair the underlying defect for optimum performance. Below are some of the causes of your furnace blowing cold air.

Leaky Ductwork 

Air ducts may wear down from pressure imbalances, vibrations, and temperature fluctuations. As such, duct joints can disengage while the seals deteriorate, leaking hot air through the gaps and holes. Moreover, pests can enter your house and eat the duct material, causing them to leak. Due to this, heated air will escape to the unconditioned space, leading to cold air circulation. If this is the case, engage a heating contractor to patch and insulate your ductwork to minimize energy losses. 

The Pilot Light Of Your Appliance Is Out

Unlike modern units, aging furnaces ignite the burners using a pilot light. Unfortunately, dirt accumulation on the thermocouple can hinder electricity from reaching it. This results in the pilot light going off, cutting the gas supply. On the other hand, an enclosed spot can lead to the system running out of combustible air. This prevents the pilot light from lighting up, causing the gas valves to close. Finally, the thermocouple can bend from mechanical stress, restricting current flow. Consequently, the pilot will go out, preventing the burners from lighting up hence cold air circulation.

Wrong Thermostat Settings

If your heating appliance is blowing cold air, your thermostat could be the culprit. For instance, if you switch the thermostat to 'on,' the blower will continue to function when not cycling. Alternatively, configuring your thermostat to a set point lower than the current temperature can hinder unit operation, causing it to blow cold air. Therefore, you should configure your thermostat to 'auto' with a set point a few degrees higher than room temperature for the unit to blow heated air.

Weak Gas Supply  

A heating unit requires a continuous supply of gas to provide heat. Unfortunately, lines supplying gas can deteriorate and leak, causing the system to deactivate. Consequently, your appliance will blow cold air. Thus, you must hire a furnace repair specialist to patch gas leaks and check whether the gas valves are functional.

Keep in mind that a furnace blowing cold air will skyrocket your energy bills. Therefore, you should schedule regular visits with a heating contractor to service your unit for peak efficiency. For more information on furnace repair, contact a professional near you.