Why Is My Furnace Blowing Cold Air?

Why Is My Furnace Blowing Cold Air?


If your furnace is blowing cold air you’ll want to act quickly.

When your home gets cold inside, not only is it uncomfortable for residents and guests, but it can also cause other issues like frozen pipes so it’s important to take care of furnace issues as soon as you notice something is wrong.

Older furnaces can have some issues, but even newer models can malfunction, so it’s important to know what problems you can address yourself and when it’s time to call in the professionals.

Furnace Troubleshooting Tips

When you notice your furnace is blowing nothing but cold air, there are a few things to check that will make it easier to pinpoint the problem.

  • Check Your Thermostat: Some HVAC systems are controlled by thermostats that have three settings — hot, cold, and fan-only. On the fan-only setting, the unit’s blower will run continuously, regardless of the temperature setting on your thermostat. If you notice only cold air coming through the ducts, check to make sure your unit isn’t set to fan-only. Instead, set your thermostat to auto, which allows the fan to run only when the room’s temperature reaches the set point on the thermostat.
  • Check Your Air Filter: If your furnace’s air filter is dirty or clogged, air won’t be able to effectively circulate. Additionally, a clogged air filter will raise the internal temperature of your furnace and integrated safety features will cause the unit to automatically shut down. Replace the dirty or clogged filter then see if your furnace operates normally.
  • Check to See If the Pilot Light is Out: Some older furnaces have a pilot light. If the furnace has a pilot light, it needs to be lit or the unit will blow cold air. Check the pilot light and if it is out, you will need to relight it. Follow the directions in your owner’s manual. If the pilot doesn’t remain lit, it’s time to call a professional HVAC technician.
  • Check Your Ductwork: Leaks in the ducts can cause a furnace to blow cold air because heat escapes through the leaks. If you notice duct leaks, call a professional who can properly seal these gaps and improve heat distribution.
  • Electric Control Panel Issues: Some newer furnace units use sophisticated computerized controls and sometimes the system needs to be reset. Try to turn off the furnace’s power switch, wait a few minutes, then restore power to the unit. If a system reset doesn’t correct the issue, you may need to consult with a professional.

If any of the simple troubleshooting tips don’t work, it’s time to contact a professional HVAC technician who can diagnose the problem and get your furnace working properly again.

Get Help from Professional HVAC Technicians

Although some of the causes for furnaces blowing cold air can easily be identified and corrected by a homeowner, some cases can only be resolved with the help of a qualified HVAC technician.

Prevention is also important, as many furnace issues can be the result of untimely or improper maintenance. An HVAC professional can recommend a furnace maintenance schedule that will keep your HVAC system running in top condition.

Forney Air serves homeowners and businesses with top HVAC technicians. The knowledgeable staff at Forney air is there for all of your HVAC maintenance needs as well as 24/7 emergency service for added peace of mind.

If your furnace is blowing cold air or experiencing other issues, contact Forney Air for expert help.

Call us at (214) 924-9745 or contact us online.


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