December 8, 2019

There are a few things to check when you feel your heater blowing cold air. These are easy items to troubleshoot that anyone can do. It’s only after checking these that it might be time to contact an HVAC specialist.

Check Your Thermostat

Check to make sure the fan switch is set to “auto” rather than “on.” When it’s on, the fan will constantly run whether or not the furnace is heating air. This means it will blow cold air when the furnace is off. The auto setting will allow the fan to only operate when the furnace is on.

Check Your Air Ducts

If you have cold spots in your home, it’s likely because there’s a problem in your air ducts. There could be a hole or gap in one, which is allowing hot air to escape.

Check the Filter

A dirty filter will block airflow. It reduces the volume of hot air blowing into your house and reduces return airflow. A dirty filter can also cause your furnace to shut down if it causes an overheating situation.

Check the Blower Motor Panel

This panel on your furnace needs to be fully closed. There’s a safety device that prevents the furnace from operating if this panel is open. Check to make sure that it’s pressed all the way in.

Check for Water Around Your Heater

Modern, high-efficiency natural gas furnaces have a condensate line. These furnaces create water that empties through the condensate line. If this line is blocked, water will pool outside the furnace. It also causes an overflow kill switch to flip, which shuts down the furnace.

The Pros to Call

If checking these don’t solve your problem, McGowan's Heating & Air Conditioning can help. We’ve been assisting homeowners in the greater Jacksonville area for more than 40 years. Our services include duct cleaning, attic insulation, indoor air quality, commercial work, and more. Contact us today with any questions.

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