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August 2020

Furnace Blowing Cold Air

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What Causes a Furnace to Blow Cold Air? If your furnace is blowing cold air, it will not properly heat your home. This type of issue is actually a very common HVAC problem to have. There are several possible causes of a furnace blowing cold air, so it can be hard to give advice without gathering further information. However, below are some common causes that will cause your heating system to blow cold air. Thermostat is Set to ON Position Is your thermostat set to the ON position instead of the AUTO position? Check your thermostat for this important setting. If you have your thermostat set to ON instead of set to AUTO, the furnace blower will blow air continuously even when the burners aren't warming the air, causing cool air to come out of your registers. By setting your thermostat to AUTO, the blower will only blow air when the furnace is heating. Some people choose to leave their thermostat on the ON position as it helps filter air throughout the house. Your Furnace Has Overheated It is possible that your furnace has overheated. Your furnace has a safety mechanism inside called a "limit switch" that monitors temperature and will shut down when it becomes too hot to prevent a fire from starting inside your furnace. The most common cause of a furnace overheating is a dirty air filter. Your furnace filter protects your furnace. If your filter is dirty, not much air can pass through and in turn,...
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