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Why is my Furnace Blowing Cold Air?

Why is my Furnace Blowing Cold Air?

  • Furnace
  • Heating
Furnace Repair by King Air

Is your furnace giving you the cold shoulder by giving you cold air when you want it warm? There are several reasons this might be happening. Fortunately, most of these reasons have easy fixes that won’t require you to call a professional. Still, if the situation calls for it, you should get professional help. We here at King Air are able to help you figure out what you may need to do to fix your chilly problem. Furthermore, if the situation does call for it, we’ll be able to step in and offer professional help.

Here are five reasons your furnace may be too cold:


The furnace isn’t warmed up:

Did you just get a blast of cold air that slowly turned warm when you first turned your furnace? If that’s the case, then there’s nothing to be worried about! Furnaces, like the heat in your car or hot water from your sink, needs a bit of time to warm up. Of course, if warm air doesn’t start blowing after several minutes, then there is an actual problem.


The thermostat is set to ‘On’:

If you’re getting a constant stream of cold air, even when the furnace is off, an easy fix is to check and see if your furnace’s fan is set to ‘on’ or ‘auto.’ The fan is supposed to blow warm air out when the furnace is on. If it’s set to ‘auto’ it’ll only do this when the furnace is actually on. However, when set to ‘on,’ the fan will constantly blow, even when your furnace isn’t heating the air.


A dirty flame sensor:

If your furnace starts out hot but quickly turns cold, the problem may be your flame sensor. Gas furnaces that don’t use pilot lights for ignition use a spark or a hot surface igniter to ignite the gas. The flame sensor creates a small current of electricity to detect the flame and shuts the furnace off if it can’t detect heat in order to prevent a gas leak or other issues. If it’s dirty, it might have trouble detecting the heat. If you’re familiar with furnace components, you can clean it yourself. Otherwise, you can call an HVAC technician to help you.


The pilot light is out:

If your older furnace is blowing cold air, the pilot light might be out. The manufacturer’s instructions should tell you how to fix it. If you don’t feel comfortable doing so, you can call your utility company or an HVAC technician. You may also need to call an HVAC technician if the pilot light won’t stay lit or there’s a problem with the thermocouple (the copper rod the pilot light flame hits.)


A dirty air filter:

If your furnace’s air filter is clogged, your furnace will run longer to heat your house until it overheats and only produces cold air. All you have to do is replace the dirty air filter with a new one. Once replaced, everything should run normally.


If none of these solutions help, you should definitely call one of our HVAC technicians, as it’s likely a more serious problem.


Why trust King Air with my heating?

Since 1979, King Air Conditioning & Heating has provided the kind of high-quality service that only comes with years of experience. Our highly-skilled technicians know just how to fix any heating or cooling problem you have. We only consider the job done when you’re 100% satisfied with our work. If you need any help with your heating or air conditioning, call King Air today!

By Brian Renadette

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