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Why Is My Furnace Blowing Cold Air?

Nothing is more frustrating than when the weather turns cold, and your heating system stops working. If your furnace starts blowing cold air, or even air that is not warming your home, it’s likely time to call an expert.

Furnaces can be complicated pieces of equipment, and with DIY repair, you may end up voiding your warranty, leading to major complications in the future. Finding the right parts to repair your furnace with can also be tricky, and using the wrong replacement parts could be a costly mistake.

A few common problems may cause your furnace to blow cold air. Jack Lehr Heating, Cooling & Electric has provided affordable heating services for over 50 years. We can help diagnose your furnace issues and get it back up and running.

Call 610-596-9967 for furnace repair in the Greater Lehigh Valley area.

4 Common Reasons a Furnace Will Blow Cold Air

Thermostat: It’s true that a furnace blowing cold air could be a simple problem. The first thing you should check is your thermostat. If the fan is set to on, you’ll want to switch it to auto. This will stop cold air blowing in when the heat is not on. If you flip the switch on your thermostat and the furnace is still blowing cold, it could be a bigger issue.

Fuel problems: Whether your furnace is fueled by oil, gas, or electric, if the fuel supply is cut off, then the air will not be heated.

  • With oil furnaces, the blockage could be due to clogged filters. These filters need to be checked and replaced before the furnace can work correctly.
  • Gas furnaces may stop heating if the pilot light has been extinguished. Though it may seem as easy as just lighting the pilot light, it’s not a good idea to fuss with gas furnaces unless you’re qualified.
  • Electric furnaces may stop working due to breaker issues. If this keeps happening, it’s best to call an electrician.

Failing parts: Your furnace is made of myriad electrical components. As your system ages, these parts may fail. When this happens, cold air will blow from your system, or your system may not work at all. Calling a trained electrician is the best way to diagnose what’s going on. These parts can then be replaced quickly without further damaging your system.

Flame sensor: A dirty flame sensor is the most common reason a furnace will blow cold air. When the sensor is dirty, it may cause your furnace to start blowing hot air, but then the air will quickly turn cold again and begin blowing into your home. You’ll need to call a qualified electrician so they can clean the sensor and check for any other problems.

Contact Jack Lehr Heating, Cooling & Electric for Furnace Repair

Whether your furnace is blowing cold or you’re looking to install a new system, Jack Lehrs’ technicians have the knowledge and equipment to help. Our certified technicians are trained in all the latest technology.

We will never send a sub-technician to your home, as we believe in providing exceptional service with every visit. All products and parts we install are of the highest quality. 

When you call Jack Lehr, you can expect high-quality work at affordable prices.

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When you choose Jack Lehr Heating, Cooling & Electric, you’ll benefit from our:

  • 50+ years of experience
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