Six Reasons Why Your Furnace Is Blowing Cold Air in the Winter

When the chills of winter settle into the Northeast Ohio area, the last thing you want is a furnace that isn’t working right. It’s uncomfortable and can also signal underlying issues that require immediate attention from a trained professional.

In this blog post, the heating experts at Kobella Plumbing Heating Cooling explain six common reasons why your furnace might be giving you the cold shoulder.

1. Thermostat Issues

Sometimes the issue is as simple as an incorrect thermostat setting. If the thermostat is set to “on” instead of “auto,” the blower will run continuously, even when the furnace isn’t heating the air. Double-check your thermostat settings to ensure it’s set to “auto” and that the temperature is high enough to trigger the heat.

If your thermostat is broken, it might still let you adjust settings, but it can fail to read the right temperatures, causing cold airflow.

2. Dirty or Damaged Air Filter

An air filter clogged with dust and debris restricts airflow, causing the furnace to overheat and shut down its burners as a safety precaution. The fan then blows unheated air. Checking and replacing your air filter once every 90 days or sooner is a simple solution that can restore proper airflow and heating efficiency. Regular maintenance can prevent this issue from recurring.

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3. Clogged Condensate Line or Pump

High-efficiency furnaces produce condensation that needs to be drained away. If the condensate line or pump is clogged, the system may shut down the heating process to prevent water damage, resulting in cold air blowing through your vents. Clearing the blockage or ensuring the pump is working correctly can resolve this issue.

4. Leaking Air Duct

Leaks in your ductwork can allow cold air from unheated spaces like attics or basements to mix with the warm air from your furnace. This dilutes the heat, making it seem like the furnace is blowing cold air. Inspecting ducts for visible holes or gaps and sealing them can improve heating performance and energy efficiency.

5. Clogged Coils

Over time, your furnace’s coils can become clogged with dirt and debris, reducing their ability to transfer heat. When this happens, your furnace may struggle to produce warm air, resulting in cold air being circulated instead. Regular maintenance and cleaning of the coils can fix this issue and prevent it from happening in the future.

6. Pilot Light or Gas Supply Issues for Gas Furnaces

For gas furnaces, a malfunctioning pilot light or issues with the gas supply can prevent the burners from igniting. Without combustion, the furnace can’t produce heat, leading to cold air circulation. Check if the pilot light is lit and ensure the gas valve is open.

The pilot light should glow blue. If the flame is yellow or non-existent, you have an issue. If the problem persists, it’s best to consult with a professional to address potential gas supply issues.

Schedule a Furnace Inspection in NE Ohio

If your furnace is blowing cold air, it’s critical to address the problem quickly to avoid further discomfort and potential damage to your equipment. At Kobella Plumbing Heating Cooling, our team is proud to offer the comprehensive furnace tune-ups that Ohio residents trust.

Our experienced technicians can diagnose any underlying issues in your system and provide the necessary repairs to restore warmth to your home quickly.

Don’t wait until your system fails in the dead of winter — contact us today to book a furnace tune-up.