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Why is My Furnace Blowing Cold Air?

Posted On: January 3, 2022

During the cold Pennsylvania winters, your family looks for warmth and comfort inside your home. However, what if you turn on your furnace and realize that it’s blowing out cold air instead of warm air? When it’s cold outside, this could present an alarming situation for you and your family. Let’s take a look at why your furnace may be blowing cold air?

8 Common Furnace Issues

Let’s look at eight common reasons why your furnace might be blowing cold air:

1. Your Furnace is Still Warming Up

If your furnace hasn’t been used in a while, make sure to wait a few minutes for hot air to come through. Homeowners who turn on their furnaces for the first time this season often face cool air. This condition occurs because turning on a furnace is similar to bringing a pot to boil; your furnace needs time to warm up slowly.

However, if it’s been over 15 minutes and your furnace is still blowing cool air, continue moving through this list.

2. Incorrect Thermostat Settings

Although there’s a chance your thermostat is broken, you may have the wrong setting inputted on your thermostat. When the season changes from summer to fall, it’s common for homeowners to forget to adjust their thermostats. Make sure the thermostat is set to “Auto” and not “On.” 

3. Dirty Furnace Filter

If the air filters in your furnace aren’t changed on a regular basis, they are likely clogged and congested. This congestion can cause your furnace to overheat and turn off since airflow to your furnace is restricted.

4. Overheated Furnace

There’s a safety mechanism inside your furnace that will automatically shut your furnace down when it’s overheated. This feature causes your furnace to blow cool air temporarily while also shutting the furnace off.

Here are a few reasons other than a clogged filter why your furnace may be overheating:

  • Mechanical failure
  • Age
  • Dirt buildup

If you suspect your furnace is overheating, our techs can help determine why. 

5. Clogged Condensate Line

High-quality furnaces are equipped with condensate lines that transport water away from the furnace. If a clog presents itself in the condensate line, your furnace won’t be able to ignite. When this occurs, only cold air will blow from your furnace. 

6. The Pilot Light Continues Shutting Off

If the pilot light in your furnace keeps going out, you may have a broken thermocouple inside your furnace. Although this is usually a problem older furnaces face, they are easily replaceable by your local Scranton, PA, HVAC experts at T.E. Spall & Son.

7. Gas Supply Issues

If there’s an issue with the gas supply of your furnace, your furnace will instantly shut off. The cause may be an inadequate supply in the tank or an issue with how the gas reaches the furnace.

8. Leaking Air Ducts

When there are holes, leaks, or any type of disconnection in your air ducts, the hot air will escape before making it to your home. A professional inspection from T.E. Spall & Son will help identify the problem areas.

Is Your Furnace Blowing Cold Air?

Since 1985, T.E. Spall & Son has been providing furnace repair and furnace service to properties all throughout the Scranton, Pennsylvania area. Our expertly trained and friendly professionals are here to guide you through every step of the process.

If your furnace is blowing cold air, and you need immediate assistance, CALL SPALL today. Your comfort and quality of life are our biggest priorities! We are here to help with all of your HVAC and furnace repair needs. Contact us online or give us a call today at (570) 230-8821 to speak with a home heating professional.

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