Why Is My Furnace Blowing Cold Air?

Is your furnace giving you the cold shoulder? When you come to the realization that your furnace is blowing cold air, it can be frustrating, but wait-we can troubleshoot together! Here are some tips and tricks that you can try on your furnace when it’s blowing cold air.


One of the issues leading to your furnace blowing cold air is if the fan setting is turned on. Check your thermostat to make sure this setting is on auto instead. This will ensure that the blower is only on if your furnace is heating the air. If you notice that your furnace is blowing cold air sometimes and then warm air other times, this could likely be the issue.


Your furnace could be blowing cold air if the filter is too dirty. A dirty air filter can restrict airflow, causing your furnace to overheat. This can trip your system and make it blow cold air. Turn off your thermostat and check your air filter. If it is dirty, replace it. If the problem still lingers after you have turned your furnace back on, you may need to call a technician to reset your system.


Do you have an older furnace? Are your pilot lights not lit? If so, this means that the furnace’s burners won’t light resulting in no heat. If you have this problem, you can try relighting the pilot light following these steps:

Turn your thermostat from HEAT to OFF.

Find your furnace’s pilot light assembly and reset the switch. This switch should be found near the bottom of your furnace, but can also be found by checking your manual.

You can reset the pilot by turning the knob to off for 3-5 minutes. Now you will turn the knob to pilot and press down on the knob. As you press down on the knob, hold a lighter to the pilot opening until a flame lights. Turn the knob on and the furnace should ignite.

Don’t forget to turn the thermostat back on as well!


Hopefully one of these tips have helped you successfully troubleshoot your furnace. If you continue to have issues, feel free to give us a call at 515-965-7272.

15 views0 comments

Recent Posts

See All