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Why Is My Furnace Blowing Cold Air?

In the south, as soon as the temperatures drop below 60 degrees, we are turning on the heat and cranking up the thermostat. When this happens, the last thing you want to find out is that your furnace is blowing cold air!

 If the air coming out of your vents is cold when you have the heat on, there could be a few potential causes with a simple solution. To help you run some troubleshooting, we came up with a list so that your home is sure to be warm this winter!

Pilot Light Problems

A furnace blowing cold air could be a symptom of your ignition system not working properly. If the pilot light is blown out it cannot light the fuel, causing your home not to heat up. This is a common problem and can be easily fixed, but if it happens often it may be time for you to consider upgrading your heating system.

Air Duct Problems 

Your air ducts can play a big role in keeping your home heated to its desired temperature. Leaks, holes, or loose connections in your ducts can all make your air blow cold. So it may not be a furnace issue but rather a result of cold air from the attic getting into your ducts. This may require a little work to seal the holes or replace the ductwork, but it will be well worth it in the end!

Gas Supply

In the warmer months, we don’t always need the gas turned on, so a cold home come winter could also be from the inadequate gas supply. Make sure your gas is turned on and that the gas line is supplying enough gas to your furnace. This can be checked on the pressure gauge located outside your home. If your gauge reads less than 15% there’s a good chance it’s timed for a refill.

Condensation Drain Line Clog

In some more modern, high-efficiency gas furnaces, you can run into the problem of your furnace producing too much condensation. In the heating process, condensation is formed and removed through a drain line and pan, however, when there is too much condensation, your drain line may become blocked. When this happens, the furnace has a sensor built in to ensure it doesn’t fire which could lead to your air blowing cold.

Get your furnace problems fixed

If you’ve tried all of the above and still don’t know why your air is blowing cold, it is best to let someone with extensive gas furnace knowledge come take a look. You don’t want to make the problem worse, and you certainly don’t want your air to stay cold.

There’s no need to freeze this winter! You can call our professional technicians at Sewell Service Company today, and we will have your furnace running like new in no time.

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