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The last thing you need on a chilly day is an icy blast of air from your furnace. There are a number of possible causes of constant and intermittent furnace cold air. Let's take a look at the most common causes.
Your thermostat's fan setting could be the reason behind your furnace blowing cold air. When set to "on," the fan will constantly blow even when your furnace isn't running. The air that blows out of the vents when your furnace isn't providing heat will feel cold. Adjust the setting to "auto" to make your furnace only blow warm air. When your thermostat batteries are low, the normal functioning of your furnace can also be affected. They can result in incorrect temperature inputs that make your furnace blow cold air. Make sure you check your batteries and replace them accordingly.
A dirty filter is also a likely culprit for a furnace blowing cold air. It blocks airflow into the furnace, triggering a safety control that turns off the burners to prevent overheating. Therefore, you should replace your dirty filter.
The pilot light constantly burns to ensure your heating unit ignites easily. If your unit continuously blows cold air, the pilot light may have gone out. You can relight it by following the manufacturer's instructions. If your furnace is still blowing cold air and none of the three causes is to blame, there may be a more technical issue. Make sure you contact a professional HVAC technician. If you need assistance with your furnace cold air problem in the Hampton Roads area of Southeast Virginia, please contact us at Russell's Heating & Cooling. Our goal is to help educate our customers in Chesapeake, Virginia and surrounding areas about energy and home comfort issues (specific to HVAC systems). For more information about furnace problems and other HVAC topics, download our free Home Comfort Guide or call us at 757-750-1831. Credit/Copyright Attribution: “elisariva/Pixabay”